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**Summary::**help explaining notation with derivatives.

**Mentor note**: Thread moved from technical section, so no homework template is included

Sorry. I did not realize there was a dedicated homework problem section. Should I leave this post here?

Basically the following (homework) problem. I havent dealt with tensors before. well. not explicitly tensors i suppose.

b_ij are constants, show that

(b_ij x_j)_,k = b_ik

what i know is that i will make a partial derivative

b_ij dx_j/dx^k = b_ik

how does the derivative simplify to the right handside?

for a little bit more context, i am taking an intro to multiferroics (not my choice, i am forced to by my university). and i am posting it in this thread since google search results abut tensors lead me to questions posted in this sub-forum. thanks for your time

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