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jesshuifeng

because the result for the order of x1 and x2 partial derivatives is the same as x2 and x1

seven

The order of the partial derivatives does not matter for continuous functions.

achekuri

Ans: The matrix is symmetric because order does not matter for partial derivatives of higher order. Ex: dy/du * dy/dv = dy/dv * dy/du

Kevinzzz

Because the order of partial derivatives does not matter

jyu

It doesn't matter for which variable we calculate the partial derivative first.

chenruis

Because the partial derivative over two fixed variables does not change no matter which variable you put first. Probably it is easier to use the graphical / geometric meaning of it?