Nonlinear third-order tensor operator

How does it define a nonlinear differential equation. Google is being a jew.
I've got a set of 2 DEs defined by:

N is the nonlinear third-order tensor, A is a 2x2 matrix, C are constants.
, obviously.
Does N x mean a contraction, an external product? What is it?
Pointers to books that explain this and don't make one insane are appreciated.

i dunno lol

>>2
Helpful as usual, faggot.

Probably a contraction. Seems like it would get pretty hardcore with it being an external product.

>>4
OP here. If the tensor is described as non-linear, would that mean it isn't Cartesian?

>>3
I'm going to have to agree with >>2.

>>1

You asked at the wrong place. Search for a board whre you really get help.

I mean it!

>>7
OP Here. Never mind, I figured it out.

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