Kronecker Delta

[@fufaev-alexander]

Support me if you want me to create more theoretical physics videos: kzbin.infojoin Do you want to solve every physics problem? Try my eBook! ✅ Contains many useful physics formulas. ✅ Understandable for everyone, because it contains no vectors and integrals. ✅ Formulas are colored and visualized. ✅ Perfect for high school and undergraduate physics students. Click on the following link to get the book: en.universaldenker.org/physics-equations-book

[@AmirRezaee-nq6hy]

This is the best explanation, I didn't understand anything in my 90 minutes course of university but in 10 minutes i totally got it. Thanks 🙏

[@fufaev-alexander]

nice! Thank you for your feedback! :)

[@yc1763]

Appreciate this, this 10 minute video clip is way more better than a 90 minute lecture in college

[@fufaev-alexander]

Thank your very much!

[@rethwikasasikumar7271]

❤

[@Takkodachs]

Wow. As a German engineering Student i did understand more in this video, than i did, listening to hours of lecture

[@Mikey-mike]

You are such a great teacher, one of a kind. Ausgezeichnet !

[@fufaev-alexander]

Thank you very much!

[@jesusm1583]

I love your videos!! Keep the good work, you have one of the best real science channels in KZbin

[@fufaev-alexander]

Thank you very much!

[@Jon_]

good intuitive explanation with nice visuals, thanks man

[@fufaev-alexander]

Thank you very much! Feel free to join the polls I'm doing in the community tab. There you can vote for the next video topic: kzbin.infocommunity If you regularly visit my channel and like my videos, I would be happy about 1 x coffee ☕ per month: kzbin.infojoin

[@dastin7276]

Excellent instruction - well presented - complete/concise. Excellent. Thank You.

[@shashanks.k855]

Love this graphically clear explanation, thank you for putting in so much work

[@fufaev-alexander]

Thank you for your feedback, shashank! 🙂

[@KodxQ8]

Guy took 10 minutes what my professor took weeks to explain. Thanks a lot.

[@fufaev-alexander]

Hehe, I feel you 😅

[@VKHSD]

this is just a fancy '1'

[@shee_eesh]

감사합니다! Learned the basics of tensor from your lectures. it really helped

[@fufaev-alexander]

Thank you! Glad to hear it!

[@dinmohammadarsalanqazi9915]

Beautifully explained. I have my Classical Mechanics exam tomorrow. If I ace it, I will give you the credits because my teacher is not responding to my messages. Thank you.

[@fufaev-alexander]

Thank you! I wish you good luck tomorrow with the exam

[@dinmohammadarsalanqazi9915]

@@fufaev-alexander I will not disappoint you!

[@dinmohammadarsalanqazi9915]

@@fufaev-alexander you are very welcome!

[@dinmohammadarsalanqazi9915]

Well, there was a question to draw a graph of a function and it higher powers. I went into infinity mode. Couldnt get out of the loop. Anyway, I aced the exam of Mathematical Methods for Physicists without much effort at all.

[@SandeepKumar-mc4kf]

Nice and clear explanation 👏

[@fufaev-alexander]

Thank you!

[@dudeyouhavenoidea]

thanks

[@CEMHanuragIIT]

Nice video and very helpful and clean editing.

[@fufaev-alexander]

Thank you very much!

[@Mahdi.alkawaz]

Danke! Ist das der Anfang einer Serie?

[@s.mcreation4076]

Love you sir for this video 🤩🤩 i🙏🙏🙏

[@marcosconceicao3223]

Thank you so much for your explanation!

[@fufaev-alexander]

Thank you for watching! Check out my physics website: en.universaldenker.org :)

[@Catalinawolff]

THANK YOU !

[@abrarahmad8036]

Keep up the great work....

[@fufaev-alexander]

Thank you very much!

[@CEMHanuragIIT]

Sir how to prove rule2 properly?

[@matheusaraujo6445]

Thanks bro!

[@fufaev-alexander]

Hey Matheus, thank you too for the comment!

[@AJ-et3vf]

Great video 📷📸 thank you

[@tee3556]

Thank you so much!!!

[@fufaev-alexander]

You're welcome, tee

[@ManojKumar-cj7oj]

You got a new subscriber ❤️😁

[@fufaev-alexander]

Thank you!

[@RahulSharma-oc2qd]

Is it possible to make a video on variational calculus that we use at multiple places, e.g to get equation of motion and all?

[@abhinuyadav1160]

Hi i like your videos . Can you please make video on lagrangian , hamiltonian and thier derivation covering all topics(d alemberts priciple, euler's equation).

[@oyibechibundu628]

Can you do a video on tensor calculus

[@nargonne]

Brilliant!

[@fufaev-alexander]

Thank you very much!

[@engrtsayyedalihassanshah2999]

Great methodology

[@fufaev-alexander]

Thank you very much!

[@atharwgade1131]

damn, this cleared everything!!!!!!!!!!!!!!!

[@fufaev-alexander]

Thank you very much!

[@user-dv4bv8df1j]

Vielen Dank

[@fufaev-alexander]

Thank you!

[@BrickBreaker21]

I want to learn the "radical physics"

[@vincentlanglo7367]

2:05 isn't it supposed to be 3*delta(ij) delta(jk) bexlcause thezly are added on the right side?

[@NatHsu11]

no - the 3 values on the right are not all the same. If you chose specific values for i and k and try it out, you'd get 1 if i and k are the same, and 0 if i and k are different. That matches the result you'd get from the summation property: delta(ij)delta(jk) = delta(ik)

[@manusebastian39]

Please explain why the rules came so instead of just stating them.

[@fufaev-alexander]

Check out my lesson: en.universaldenker.org/lessons/202

[@jannatch2189]

Is kroneker delta on isotropic tensor

[@fufaev-alexander]

ye

[@MrBogdanel1285]

I like your videos, but the Einstein summation convention is not used like that. You need one covariant index and one contravariant index. Which becomes important when you go to general and special relativity.

[@fufaev-alexander]

Yes, you are completely right. I didn't want to complicate the topic with covariant and contravariant indices. The Einstein summation works just fine for doubly occurring indices, placed no matter how: on top, on the bottom, on the left, on the right or upside down. 😃

[@anishthapa5058]

Imagine a 50D vector. :D :D

[@fufaev-alexander]

[@jimithjoy6312]

👌👌

[@fufaev-alexander]

:)

[@blaqsimongfx3141]

You are just so wonder

[@fufaev-alexander]

Thank you! Check out my new physics website: en.universaldenker.org :)

[@jamiepianist]

9:26 haha, bj

[@fufaev-alexander]

😅