My response to being reverse-Dereked

The Riddle That Seems Impossible Even If You Know The Answer - Veritasium
• The Riddle That Seems ...
The unbelievable solution to the 100 prisoner puzzle - Stand-up Maths
• The unbelievable solut...
FACE REVEAL - The 1M Subs Q&A - Steve Mould
• FACE REVEAL - The 1M S...
Main channel over here: / standupmaths
And here is that paper: doi.org/10.1007/BF02986999
Legit free copy: www.cl.cam.ac.uk/~gw104/Locke...

[@eidolonish]

Takeaway: Derek is too famous, Matt is too pedantic, and Steve Mould is the nicest man on the planet.

[@odesseus]

This made me smile

[@jonathanl8538]

Matt should write a book on maths errors. … Oh wait.

[@cossaertom]

Did you mean to say Matt errors?

[@thefountainpendesk]

@@cossaertom That would seem like a Parker square of an error

[@angelusmorningstar]

@@cossaertom that would just be a book of spelling errors 😂

[@moonliteX]

people know what they do.

[@marijnl]

@@cossaertom That would be more of an encyclopedia then

[@SmarterEveryDay2]

Classy video.

[@Vodboi]

2nd channel-ception

[@reububble]

I like to think you (Destin) were on your main channel when you saw this but decided to swap over to your second channel to comment, just for the "second channel-ception".

[@wobblysauce]

2nd channel got their back.

[@SmarterEveryDay2]

@@reububble nope sorry, was logged in on SED2

[@jollyjoystick1696]

@@SmarterEveryDay2 Hi Destin nice to meet you on a comment section 😄

[@_notch]

Now THAT is a delightfully spiteful counter correction! I strongly approve.

[@Twosies20]

No checkmark? 🙃

[@jerry3790]

Notch?

[@rws531]

@@Twosies20 because it’s not Notch

[@PiercingSight]

@@rws531 It is. That's his youtube channel. He's posted some of his other programming experiments there.

[@bknesheim]

Could be used as the definition of nit-picking.

[@storyspren]

Ah yes, the Parker Correction, which looks and sounds like a rounding error is about to be pointed out, but which then points out that the rounding is actually correct but it needs to be known that this number has been rounded :D

[@strandedinparadise8202]

Parker Correction gets my vote!

[@bralex6669]

I *immediately* though of a montage similar to that of the Parker Square. We need Brady on this.

[@fuseteam]

derek now got parkered xD

[@Anytus2007]

I also thought of "Parker Correction" but do we want to save that for when you attempt to correct someone else's mistake, and your correction is *almost* correct, but not quite?

[@storyspren]

@@Anytus2007 That's already called "incorrecting" someone in my lexicon so I didn't think about that :P But since Matt was fully aware of the almost-perfect nature of the square when making it, I'd say almost correcting someone but not quite correcting them on purpose is closer to the intent

[@SimonDonkers]

Derek being loose on the language and digits, does that mean he should get reverse-reverse-Dereked?

[@chitlitlah]

Derek played the reverse card on Matt and Matt played one right back with his "Your calculation is 1% off." But Derek had nothing but a wild card left so he won anyway.

[@iidoyila]

didn't matt get matted anyway , dereking was a different thing

Does reverse-reverse-Dereked cancels out to just Dereked?

[@madmaveric]

would that not be reverse-Dereked-reversed (Why do I feel like Sheldon cooper is about to appear and correct us all :D).

[@Qermaq]

@@madmaveric It's Dereks all the way down.

[@der.Schtefan]

Glad that you accepted the reverse-Derek so gracefully without having the need to find a flaw.

[@EntropicTroponin]

I found Derek's call-out of the mistake quite arrogant. Matt's jab at the digit is humourous in comparison

[@der.Schtefan]

@Squant Like you just now?

[@jeremiahsmith8499]

@@EntropicTroponin It's arrogant? What? He was pursuing the truth, nothing more, nothing less. You'd be a fool to think there was any bad blood or ill intent in that correction.

[@drebk]

🤣🤣😆😆

[@drebk]

@@jeremiahsmith8499 the ol fake beef between YT content creators. Never gets old

[@frankjohnson123]

Absolutely destroyed him with the 8 -> 7 correction, Matt’s still got it! Nice video

[@IqweoR]

That got me laughing so hard XD

[@goatmeal5241]

We'll call it a draw!

[@concinnity9676]

That was funny, but I think in just a teasing manner, like "two can play at this corrections game." I think they both know Veritasium was right on that; because, when one only shows one significant digit, rounding it is the best, accepted way. It's the power of ten that is important. I prefer scientific notation, "7.8 E-31".

[@thargy]

Yeah, it’s “funny” because he know that it’s a really weak “correction”

[@Hugh.Manatee]

I think my friend @@concinnity9676 meant 7.9 * 10⁻³¹ I mean if you're going to show 2 significant numbers rounding is the best accepted way 😉

[@trigonzobob]

You aren't exaggerating. You're underestimating. I showed that video to _both_ of my dogs.

[@bkucenski]

It's always nice when Matt helps out the little channels with some extra sound bites for their videos.

[@Fiyaaaahh]

Congrats on spotting the erroneous 8 Matt. How does it feel to be the Dereker instead of the Derekee?

[@mrpie3055]

Amazing

[@NeatNit]

In the off-chance this isn't obvious - ignore that spam message...

[@Soken50]

@@NeatNit No, don't ignore it, report it! With prejudice !!

[@NeatNit]

@@Soken50 Oh, I do, but that doesn't actually do anything! Comment scams don't lose Google any money so they don't bother to do anything about them.

[@abhishekpatil5768]

@@Soken50 ueah

[@davecorry7723]

That was great. I've never laughed harder at a 7 after 30 zeros.

[@TurtonatorGuy]

Drama in the maths community is so wholesome compared to the rest of youtube, lol

[@kieronsingh3007]

This feels like it has the potential to become the maths analogue of Uncle Roger and Jamie Oliver

[@dekippiesip]

That's just the nature of maths. There is no back and forth, if you're proven wrong it is definitive. There are no shades of grey or 'different perspectives' or 'a context' to consider. Just the plain cold truth.

[@pshtwhoneedsaname]

idk people got pretty fired up about the -1/12 thing

[@hughcaldwell1034]

@@dekippiesip So long as you can agree on axioms and definitions, which isn't as common as people might think.

[@MrFram]

flammablemath tho

[@aj76257]

I’ve always appreciated the corrections section in the descriptions of your videos. It’s a good philosophy towards mistakes

[@3_up_moon]

The news used to have to do this as well.

[@D33r_Hunt3r_]

They do... 3 days later on page 47, after everyone has moved on and in a place no one sees.

[@peterw9006]

Where is it here?

[@MedlifeCrisis]

Proud to be one of those [all people in the world] who whatsapped you Derek’s video hehehe

[@proloycodes]

can you send me his number not like i'll spam him or anything, really

[@memejeff]

@@proloycodes kzbin.info/www/bejne/e2eumWaXrs1kgqM

[@JaxsonGalaxy]

This reaffirms my sneaky suspicion that mathematicians are all petty dorks. I thank you for your service.

[@dan339dan]

4:47 Ah yes. The Parker Square we so fondly remember Matt of.

[@josephpowell6009]

me and my 99 homies was about to bust out of the joint with the random method. thank you for correcting that 8 to a 7. dereck was selling us false hope !

[@PinataOblongata]

Didn't bother clicking Veritasium's video and din't even know you had a second channel, but I clicked THIS video. "OOOH!" I said to myself, "INTERNET MATHS CALL-OUT DRAMA!" Little did I realise I would not be able to concentrate on a word that was said due to being faced with one of the coolest-looking shirts I have seen in a while. I bet there's even some maths behind it!

[@Ditocoaf]

Yeah, I always wish I knew where Matt gets his shirts.

[@fylosofer]

Beautiful. I was expecting and hoping for a response video. Matt, your humor, wit and congenial attitude always put a smile on my face. Thanks for being you.

[@alanwilson175]

I congratulate Matt on his sincerity. Errors occur all the time, in science and math, and we just have to recognize them later and correct the mistake.

[@ceruleanwake8876]

I love watching these channels. Not only for the education. The interest the intrigue the problem solving the ingenious creators but the drama the drama is the best. I love you guys. You always do a great job

[@Abstraxtudio]

Even though I never seen your channel and only found this one from Veritasium, I love the friendly rivalry that's going on and can't help but respect it.

[@callummacalister]

"Eventually, everyone in the world will be Reverse-Dereked" -Andy Warhol, probably.

[@cornishcat11]

fantastic comment

[@adivp7]

Love that you're having fun with editing, Matt

[@jeffreybernath6627]

The ending with the "correction" for Derek's video was great fun! I lol'd!

[@niezbo]

How cool is this, watching my fav YT creators interacting with each other is such a awesome way! Love it!

[@jesseparrish1993]

I do hope that Derek learns from this and is more cautious in the future. I'm lucky my daughter wasn't with me when that 8 came on screen but other parents may not be so lucky.

[@aslemos2009]

Man, you've fought for that 7. You've scrutinized every pixel of Derek's video, and all you got was that lousy 7. Still, formally speaking, that does even things out. Well done.

[@stephenkamenar]

that's as big of a mistake as saying pi = 3.142

[@aslemos2009]

@@stephenkamenar Yes, and we will not be silenced!

[@demoman1596sh]

@@stephenkamenar Well, not exactly. The mistake of saying pi = 3.142 is orders of magnitude bigger than Derek's mistake. Will I state exactly how many orders of magnitude? No, because then I might be making an even bigger mistake. 😛

[@varunachar87]

He could've found much more, but maybe he was trying to be nice. Derek, as he increasingly tends to do these days, muddled up a lot of details in his explanation. He gave the right answers, but for poorly communicated reasons. For example, the two copies of 100! that cancel each other out (one in the numerator and the other in the denominator) have very different meanings, which is a subtlety he should have better clarified. And worse, he did the calculation for a loop containing all of the objects, and then nonchalantly stated that the same works for any subset of the objects. Let alone mentioning that it works only for more than half of the total, it is poor communication even to take his edge case calculation and apply it to the interior cases without inspection.

[@talastra]

Off by one errors can be super disastrous.

[@donaldasayers]

The trouble with Derekassium is that he is a little bit of a troll. He is often right, but he frames the truth with limited boundary conditions to give people room to argue. His Light lighting up at the end of a very long loop of wire being a case in point, the original video was correct, but framed in a way that invited disagreement.

[@Pulsar77]

He loves clickbait, he even admits it. So he says something controversial, which will spark discussion, which gives him more views and an excuse to make a follow-up video. All for that sweet cash. Honestly, I find him more and more annoying.

[@brittoncooper1251]

Honestly, it's one of the reasons I like his channel. The deep dives other creators make while trying to correct, or confirm, his videos end up providing excellent explanations of otherwise difficult topics and different approaches to problem solving. Plus, it shows in pseudo real-time the way science actually works.

[@qwertyasdf66]

@@Pulsar77 That's why I unsubbed from him a while ago.

[@noellesears10]

@@Pulsar77 its annoying if you go into his videos expecting a scientist or a mathematician or a logician. veritasium is a performance intended to reach more people, because being purely scientific is more interesting to fewer people. inviting discussion allows those smaller and more niche youtubers to reach more people through his pop-science channel

[@skully2212]

I don't think he was correct at all and the only way he was able to claim to have been right is to have framed the question as vauge as he could, and then retconned in the actual answer after he was called out for an incorrect video that wasn't even convincing. Knowing that there's a big difference between the amount of power the light gets instantly and after a second, the only way to salvage it is to make assumptions not presented in the original video. Assuming that the light bulb isn't dimmable, which is what most people think of when there's a light bulb in a problem, then he would have been totally wrong. Veritasium has always been obnoxious and I've never felt like I've enjoyed learning anything from that channel.

[@jmatya]

Ah that last digit burn 🔥. Glad all of you form such a good company and interact with each other, that such topics are always fun to watch and laugh about in a positive way ❤️

[@TheMartijnh73]

I totally agree with you here.. that positive note is what we all should follow in my opinion. When I watched Derek mentioning Matt, I felt that as positive feedback and free advertisement immediately. I love watching both streams, Derek for his ways of bringing various messages, and Matt for his awesome way of explaining math as an expert. I'll continue watching both ;)

[@yahccs1]

Very good response to a video-response to your previous video. It's nice you managed to fit in some humour at the end! I saw Veritasium's video the other day too. I think reaction videos to other people's videos seem to come up more (on the suggested video list) as if they are more click-baity than usual! Maybe because we all like errors to be spotted... but are not so keen on having our own errors pointed out! Hopefully no one will expose someone else's errors in public in an embarrassing or humiliating way. It seems so many science/maths communicators on KZbin all know each other so are all friends and sometimes friendly rivals!

[@bluetone11]

Both Derek and Matt ( and of course Grant Sanderson + the guys at numberphile etc ) are beacons of mathematical teaching . When watching the video where Derek takes a $10,000 bet ( re: moving faster than the speed of the wind ) , he makes the statement that if he is wrong in his calculations he would want to know why .This is a very good attitude to have . Historically there has always been great rivalry in the field of mathematics . So well done Matt ( and Derek ) for upholding this tradition . Thankyou both for making such brilliant videos .

[@wallywutsizface6346]

I understood the problem from your video, but Derek definitely answered a satisfying question. The ultimate question of the problem is “how many scramblings result in their being no loops longer than 50”? Your video was sort of hand-wavy and just said we brute forced the answer with computers, whereas Derek explained how you could figure it out on just a whiteboard. Not that I don’t love both your videos, but I appreciated that aspect of his video

[@Paulsinke]

Acknowledging and exploring your own mistakes is the ultimate expression of real scientific virtue, you have shown the depths of your wisdom and converted me to a lifelong fan. Cheers!

[@howkre8ive]

Mistakes or not, I always enjoy your enthusiasm for maths! Keep it up!

[@davidwood8730]

Derek gets "dereked" a lot. His video on sailing faster that the wind and his one on the propagation of electricity in a wire got a lot of responses

[@timbeaton5045]

Not to mention the flurry of videos around Dirk (of Veriistablium* fame) and his video explaining the Poynting Vector. *Acknowledgments to CGP and Brady and their H.I. podcasts

[@GamezGuru1]

except there was nothing wrong with the sailing video, people just couldn't accept it...

[@jemandanderes7075]

Isn't getting dereked when you are in the process of creating a video but someone (often times Derek) gets a video on the same topic out earlier, so you make your original video and in that point out a little mistake?

[@zzzyyyxxx]

Yet he was correct in every one of them, even doing thorough experiments to show those that didn't accept them that he was indeed right.

[@Vexas345]

@@GamezGuru1 Nothing wrong with the electricity one either but EEs are still raging mad about it lol

[@jeff__w]

3:02 So *Matt* is wearing the identical shirt in his earlier video as in this one. So I surmise that that is his “100 prisoners problem” shirt. (He’s not like Tom Scott, is he?)

[@lolzold4]

Nice spot!

[@jeff__w]

@@lolzold4 Thanks!

[@bluemalamute]

thanks for the laugh and always making it fun. Matt is a great champion for giving it a go--can't win if you don't play/ get anywhere if you don't try--and being diligent too/ learn from the mistakes.

[@jehanr]

Using the end of a 2nd channel video for a correction on someone else's main channel video is an amazing move.

[@ohnonomorenames]

One Australian respectfully snipped another Australian so the snipped Australian fired back with an equally respectful snip. What is important to remember is that they are both enjoying a lovely summer while there homeland is in the depths of winter (although Australian winters aren't really that bad). It's almost like they are both fine with each others videos and that the reference was nothing more than a back handed complement of the others channel.

[@ThisMoose]

Technically one is Canadian, but yes

[@honorarymancunian7433]

Meh all commonwealth anyway

[@lawrymccarthy3292]

@@ThisMoose But lived in Australia long enough to qualify.

[@vagga2u14]

Our winters aren't that bad... *cries in every place I visit on the east coast of Australia getting several hundred millimetres of rain and flooding*

[@PRCDwtf]

Pretty sure Matt is British

[@kundogb]

Hahahah, was expecting this video to come and you did not disappoint XD

[@Rymunin]

Thanks for putting a smile on my face during the most thursday-like monday i have ever had

[@Aleblanco1987]

I love how you all get along very well.

[@glassman6191]

Matt, in general I love Derek's videos, but you are the master. Wonderful 'thought I point that out' and 'it all cancels out', 'move on with or lives'. Koala stamp! Well done! Love this!

Your approach to science and being humble about it to be highlighted, totally fantastic! New subscriber here at least because we need more people in science open to correction, like you!

[@DreamFreeFPV]

this whole video is just LOL. i just love the personality you bring to the table...

[@lrj3000]

That was way saltier that I ever expected! Waiting for more from this second channel

[@TheOriginalJAX]

I watched the first 6 minutes of the video then went to bed and came back to it after getting back up, Glad I watched the very end bit. Most important bit of all I do approve good Professor. I do agree this should be about lets say keeping score so once again good job.

[@lukaleroux479]

I don't know why, but the bit about first digit after those 30 zeros being a 7 and not an 8, even though it does round to 8, gave me a genuine laugh. Has been ages since I had one it feels. I'm still laughing even ad I write this and I'm not sure why xD

[@Mosethyoth]

For me it's that this number is unperceivably small. The smallest correction I've ever heard of. 1.114E−32 to be precise. It get's very close to the smallest physically reasonable unit of length we have which is the Planck length which is 1.6E-35 meters. (apparently attempting to measure any shorter distance would create a black hole)

[@wiselinden]

Youre Amazing! No one makes me love maths as much as you make me love it.

[@RickSjoerds]

Haha. Loved it! Stylish answer! Suits you! I like it when channels I follow pop-up with some things/(re-)directs from some other channels I follow.

[@baerlauchstal]

Nice one, Matt; just the right tone, if I may say so! I also heard Derek as saying the probability of a random perm having a maximal cycle order of r was 1/r, and was struck by the fact that that clearly wasn't what his bar chart showed for r

[@philipbyrnes7501]

Good onya Matt, I’m proud to be represented by two great Aussies like you and Derrick lol. Been watching you both for a few years now and am so grateful that you’ve both become the men of science that you have and for the great teaches you both are. Thanks mate, a very enjoyable rebuttal ,’)

[@onwardandupward2345]

is he not canadian?

[@onwardandupward2345]

...Derek that is..

[@Crazy_Diamond_75]

@@onwardandupward2345 Born in Australia, raised in Canada. His parents have pretty thick Aussie accents.

[@Brunoenribeiro]

The guy is smart, funny, AND humble. You're awesome Matt

[@yank5429]

A masterful nugget of cavillous face-saving (and cocooned in such a considerate chiffon!) there at the close, Matt. Derek is incomparably fortunate to have such a punctilious friend and admirer.

[@boas_]

Yeah I also spotted that mistake because I was following along doing all the calculations

[@bartjennings]

I think we all know that ACTUALLY, Matt here has been being Parker-Dereked

[@rafael2350]

I'm just amazed by the attention to details on Matt's videos

[@trigonzobob]

If he just had the same attention to accuracy :)

[@Alec0124]

Hey Matt, watching this 21 days later. Surprised I haven't found your channels before, your personality and integrity seem to really come through here. Subbing so I can hear more from you :)

[@MC---]

That is so funny that you science communicators have a term for whenever Derek beats you out to posting a video or now reverse-dereked. Reverse-Dereked has lead me to finding some really great channels. I don't know why KZbin hasn't thrown your videos in my feed sooner. I found Nick Lucid's Science Asylum because of the whole misconceptions of electricity saga. This also lead me to Medhi's Electroboom and then Steven Mould I found Dr Becky channel through a similar thing with the release of the images of the Black Hole at the center of our galaxy. Its almost as if KZbin's algorithm should have a Derek filter.

[@DehimVerveen]

Have you found AlphaPhoenix as well? It's a great channel, I highly recommend it!

[@triffid0hunter]

Also check Tech Ingredients and Applied Science for more practical science/engineering content ;)

[@kindlin]

@@triffid0hunter Practical Engineer is really good, from a civil engineer perspective. I legit learn things watching his channel, and his more recent (and relatively new to his channel) current events videos have been fascinating.

[@nekogod]

I like that you (I'm certain it's deliberate) are wearing the same shirt in both videos!

[@rishbhardwaj1431]

Well done! Now that's how one takes an embarrassing situation, owns up to it, and comes back with something funny to say. Wholesome!

[@dmerrill85m]

I can't wait for the rebuttal video!

[@PuchMaxi]

Good thing you kept the shirt, for continuity and all. Love the M.C. Escher artwork on your wall.

[@henrygreen2096]

That’s one of the reasons I went for STEM. It’s collaborative and I, myself, or other colleagues will help fix or catch mistakes in the overall goal of finding a solution. Great video as always Matt.

[@alisioardiona727]

Make sure you're the last the spot a mistake to flex your intelect.

[@PrimalBeard]

Strict definition. I laughed so hard at the end. Great video!

[@vgoj]

Been waiting for this anxiously

[@petermoore9504]

Hi Matt, here's a quick idea for you. Emma Raducanu has been incorrectly stated as being 5' 7" when she is 1.75m tall ie 5.7 feet (5'9"). This is on the WTA website and was shown on the BBC Wimbledon coverage. Is it time to go metric completely?

[@guest_informant]

This is brilliant I hope Matt sees it.

[@xpqr12345]

Regarding going metric: YES! It has been time to do that for decades!

[@guest_informant]

What happens to players who are 5' 11". Are they converted to 5.11 ft (5' 1" - rounded) :-) PS Going metric completely. Metric time and the French Revolution is worth reading about.

[@petermoore9504]

It's not just the WTA, Barney Ronay wrote an article for the Guardian on 29th June 2022 where he states Emma has a disadvantage at 5'7". Perpetuating the error.

[@baksatibi]

Regarding going metric, imperial unit countries could adopt the SI prefixes without completely giving up on the imperial units. Just pick one unit for each dimension (length, mass, volume, etc.) and start using the SI prefixes with it. For example you can have nanofeet, microfeet, millifeet, centifeet, decifeet, feet, decafeet, hectofeet, kilofeet, megafeet, etc. This would have the advantage that citizens don't have to suddenly get used to units they rarely (if ever) used in their lives, but gets rid of the non-decimal unit conversions which is probably the source of most errors when using imperial units. This also makes it easier to transition to the metric units because then only one conversion factor is needed per dimension.

[@jasertio]

Derek got Parker-Squared

[@martinmonath9541]

So hilarious at the end. Still have tears in my eyes 🤣

[@dedkeny]

The last minute of the video is gold!

[@JosephParker_Nottheboxer]

I'm laughing so much at this, but this seems to be the classic arguement of pedantics and somantics. you're both far smarter than me, heck I think Steve Mould is too. but well done in owning your minor error and explaining it, love it and love yout stuff. On a Side note I might need another copy of Things to Make and Do in the Fourth Dimention, I've lent it out to a few teachers and it's getting well dog-eared and used.

[@Yupppi]

There's something cool about being reverse-dereked, like your face pops on his channel "this guy was so ahead and interesting that I had to make a video about his thing. There's a little catch to it when I pondered about it". Also probably great continuation to the saga of reaching higher KZbin numbers. Also you got to point out a mistake in it, now you're set to launch a chain of videos like Mehdi vs Derek or Mehdi vs Steve Mould or Mehdi vs the world.

[@GoldenMinotaur]

Haha, well handled. Subbed on both your channels now instead of a suggested only viewer

[@chronophagocytosis]

LOL, that thing about the digit 8 was just absolutely hilarious! You just had to squeeze in a correction, no matter how minor.

[@qzbnyv]

I just like to imagine Dirk searching through your videos for comments where you’ve been corrected by someone on a point in material way, which then gets turned into the next Veritasium video.

[@diggoran]

HI 👋 That does seem like something that Dirk from Veristablium would do…

[@qzbnyv]

@@diggoran If you sign yourself up to the OpenAI beta, you can use their Playground to have the GPT3 algorithm list a stack of Dirk from Veristablium variations. Just give it a few you knew in a list, but also include “Dr”, “Derek”, “Muller” and “Dirk” in the restricted words list so that it doesn’t start giving you a bunch of repeats that don’t match the pattern.

[@MayorMcC666]

DEREK OWNED BY MATHS AND LOGIC

[@stefanbalauca7481]

Brilliant video, especially the final :)))

[@johnmc67]

Always good to see creators keeping it classy.

[@johnmc67]

And I’ll pass on the LCS.

[@eashanshenai4980]

Refresh the page guys, the audio is there.

[@ptousig]

You know you've made it as an educational KZbinr when you find yourself in a feud with Derek.

[@johnduncan5117]

Love the equalising move at the end.

[@Somerandomdude-ev2uh]

I think we can all hope for a series of videos with more and more pedantic corrections between these two

[@transcendentape]

I always like seeing new videos from Dirk of Veratablium.

[@jmacd8817]

It's "VeriSTABlium" 😉😇 Anyhow, hi "fellow Tim"!

[@Wordsnwood]

Take your upvote, Tim... ;-)

[@Anna-ip8ub]

I miss the Timfoolery

[@timbeaton5045]

@@jmacd8817 Hi back, to you! And I'm a bassist, too.

[@azlandpilotcar4450]

If your friend Matthew checked your check, hasn't Derek been double-Matted?

[@excluseive9769]

This was just so fun to watch!

[@Chris-nq9nb]

I love the shirt you're wearing in this. Where is it from? Also, I love your content generally, you've reawakened my love of maths over the last few years, to the extent I spent this Saturday morning looking into Roger Penrose's work.

[@afrayed]

Where is your shirt from Matt? It’s awesome!

[@petersall1055]

replace "dereked" with "cucked" and it still makes sense

[@struanpeat5116]

I remember watching the veritasium video and thinking "OH, i know this one, was it mat or someone else?" Glad you cleaned it up

[@jmac8929]

Thanks for the chuckle

[@eviltreechop]

What made me click the like button was the eagle scream logo wipe. Incase you're looking for feedback

[@thelivetoad]

Actually I thought that the only interesting thing in his video was the statement that the warden can't beat this strategy merely by ensuring that his chosen permutation has a long cycle. Because, he says, the prisoners can simply modify the strategy by doctoring the permutation -- I think he says "add 5" or something. That's genuinely interesting and would merit amplification.

[@AssemblyWizard]

Sure but what if my permutation is shifting all cards by one? (in box 1 there's card number 2, etc). This is a loop of length 100, and just by adding 5 (or any other offset except 99) the loop still exists. "This is my friend Derek, and what I think he meant to say is, all the prisoners need to remember a whole new permutation, and compose it with the given permutation" If they use some generic rule instead of another permutation, the malicious guard can construct the permutation to have big loops after the rule. If the guard doesn't know the offset they're planning to add then the 100-loop won't work, but probably there's a permutation which foils every addition.

[@thelivetoad]

@@AssemblyWizard But it may not be a single loop. Think of a loop 1->2->3->4->1 of length 4. I am not sure what Derek meant by "shift by 5" but let's imagine a "shift by 1" here. Prisoner 1 goes to box one, opens it, sees 2, and shifts by 1: result 3. They then go to box 3, open it, sees 4, shifts by 1 (cyclically): result 1. So we get 1->3->1. But crucially this strategy never opens the liberating box 4. So I am confused by what he might have meant by this. You can easily doctor a permutation (in this case in effect squaring it) to make a permutation with shorter cycles (in this case 2 of length 2 rather than 1 of length 4) but you need a way to do this and lead each prisoner to the box with their number in it. You could instead "shift by 1" by first opening box 2, seeing 3; then opening box 4 and see 1. As long as the number of prisoners isn't prime this would always reduce the length. But there are other modifications possible. So there is lots of latitude for investigating this as a game.

[@bennettpalmer1741]

@@thelivetoad The "add 1" is adding 1 to each box. The visual given was the first prisoner physically relabeling each box, then using the original strategy. So, the prisoner would first check box "1" (formerly known as box 100), then if that box contained a 6, he'd move on to box "6" (previously known as box 5), etc. This effectively randomizes the contents of each box, undoing the warden's sabotage.

[@thelivetoad]

@@bennettpalmer1741 Well, any permutation of the labels will only result in the same cycle structure as before, so it cannot undo the warden's counterstrategy. Again, the main issue is "is there a cycle of length greater than 1/2 the number of prisoners". If yes then any relabeling maintains that reality. Some prisoner will be in that cycle. One of the ways of implementing the "shift by x" strategy (the second one I described above) would in effect traverse a positive power of the permutation. If prisoner y's number is in a cycle of length L then a power of that by a divisor D of L will reduce it to D cycles of lengths L/D. Of course you don't know the length of the cycle that contains your number and at any rate you have to make sure to implement such a strategy so that your number is in the cycle you end up traversing. (See my first example above.) The beauty of the original strategy was that by starting at the box labeled with your number you'd traverse a cycle guaranteed to contain the box with your number in it. Remember, the warden will not release you if you al find a box with a relabeled version of your numbers -- you have to find the box with your number in it as put there by the warden.

[@bennettpalmer1741]

@@thelivetoad Let's just create a hypothetical scenario. Box 1->3 Box 2 ->4 Box 3->1 Box 4->5 Box 5->2. We have two cycles, 1-3-1, and 2-4-5-2. If we add 1 to all the box totals, we get Box (5+1=)1->2 Box (1+1=)2->3 Box (2+1=)3->4 Box (3+1=)4->1 Box (4+1=)5->5. We have 1-2-3-4-1 and 5-5. The cycle structure has changed.

[@marcusaurelius49]

I thought I was reverse-Dereked once, but it turns out I was just constipated.

[@kennethkoers5033]

The commitment to wearing the same shirt, as you did in your "Dereked" segment. Perfect.

[@_CJ_]

:D you have won :) Just kidding - I would love to see more videos about showing how important is to fix or let others to fix mistakes and how important is to go with that and don't get stuck on wrong solution because of ego. Thank you for fun :)

[@LeoStaley]

On brand. I love it. I also love that he's wearing the same shirt as when he got Dereked. Edit: wait, there's no... Video. KZbin is confused. It just keeps trying to buffer, but can't play video. edit 3, OK nevermind. It was KZbin being dumb.

[@nk4j272]

Yeah, the video has behaving strange for me, but I managed to watch it Edit: just a coincidence, I think the KZbin app bugged.

[@mattparker2]

I've not touched it. Must be KZbin still caching it etc.

[@0v_x0]

I get a lot of buffering and codec rendering issues on the Android app, pausing and minimizing tends to do the trick, at least if the video is all artifacted right after an ad (it's always an ad that breaks the codec into smeary rainbow pixels). I have issues maintaining wifi connection from upstairs sometimes, but KZbin is losing connection and coming back online waaay more often than I have issues with in other apps. It's just not very stable. Google seems to keep "fixing" things that weren't broken.

[@buddgaf1304]

The end of this one gave me a good laugh. Thanks.

[@Noxictyz]

Love your stuff Matt