Converting an e-NFA straight to a DFA

I was shocked to find very little about this technique online, so hopefully it comes in handy for some people.
At the end of the video I found a couple of errors in my answers that I corrected (though I may be wrong about my corrections), so feel free to let me know in the comments if you think something is up.
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[@bilawals22]

just a reminder, {1,3} should also be a final state

[@educationaboutstuff3088]

+Bill S Truuuuuuuuuuuuuuuuuue thanks I'll put in an annotation

[@frankwang8611]

Great video!!! Really helps a ton!!!!

[@KieranRamnarine086]

You said union is AND, its actually OR. Just for clarification

[@educationaboutstuff3088]

+Kieran Ramnarine I'll add an annotation

[@biancamarculescu1289]

why does state {2,3} with a go go {1,2,3} and not {2,3}? i mean, from state 2 with a you can go to state 3 but the e-closure of 3 doesn't go to {1,3} but only to 3, right?

[@Artafact367]

thank you you helped me a lot!!!!

[@gm16180]

an empty set union set 1 will be equal to set 1, so E(0 u {1}) how come to be equal to {1,3}?

[@vizvizoooo]

When you're in state 1, you would be able to go to state 3 with reading the epsilon. so the set should be {1,3}

[@vizvizoooo]

you always need to look for epsilon transition of the states you reach and add those states to your set as well.

[@brettmccausland880]

The reason is we no longer have the state {1} or state {3} instead we now have one state {1,3} and if the original went to either 1 OR 3 it is going to go to this new entirely different state {1,3} that we are creating

[@Aditditto]

thanks a lot

[@amerragab1912]

thank you

[@blueapple3440]

i hav studied this example in "michael sipser" book.when he created DFA at the end , he added an empty state also and made transitions to them . so this thing is making me confuse .can u explain that empty state thing?

[@barcode628]

The automaton in the video is not actually a dfa, seeing as there is no transition for b from state 3. There has to be an empty state there for it to truly be a dfa...

[@khannreactions3311]

@blue apple can you tell the name of book by Michael sipser ??

[@wisam105]

state 3 doesnt have an outward arrow for b transition!!

[@SambitJena28]

you can make a dead state for the b transition from 3 and you can loop for the dead state.

[@vicvic553]

I think that you should add a dead state, and try to avoid saying "oops". It's extremly irritating. ;)

[@AnkitBindal97]

Please try to speak and write a bit faster. It was way too slow for such a simple example.

[@phoenixultimate8253]

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