Kronecker Delta and Levi Civita

[cheer177]

Thank You very much.



[antizac]

If I have delta_jj, how do I know if it should be 1 or 3? The definition gives 1, but your explanation gives 3 (so does one of your properties)

[burny1]

@antizac If you get asked give the value of delta_jj then it uses 'the summation convention'(TSC) which means delta_11+delta22_+delta_33 =3 as whenever you get 2 letters repeated you sum over 3. Otherwise the top case with j=j is for when you get asked for delta_22 =1. An example of TSC would be delta_1k*delta_k1=delta_11*del­ta_11+delta_12*delta_21+delta_­13*delta_31=1. Hope that helps

[holywaterxburns]

Incredibly helpful!

[xplosiv026]

Thanks man. Appreciate it.

[LunaML]

THANK YOU! My prof just kinda decided not to cover those!

[obct]

thats class! i was doing some mhd study and realised i'd forgotten our old friend levi. nicely explained, you're a champ.

[EpsilonNF]

Very well explained

[word45621]

Wow what an obscure topic to have to look for help for.  Everything is on youtube these days, thanks for taking the time to make it.

[burny1]

@word45621 Thats why i do them cos when i come to revise there's little places to look so i go back to a time when i knew it ha.

[aziz0096]

Thank you that was helpful!!

[eddmann10]

thanks for the hlep

[alhamdulellah08]

Thank you so much !!