Clairauts's Theorem help

[Guest]

Can anybody help me with this? Find a function f(x,y) such that:

fXY(second derivative with respect to y) at a point (a,b) ≠ fYX(second derivative with respect to x) (a,b)

 

[galactus]

Here's an interesting link. See if this helps

http://en.wikipedia.org/wiki/Symmetry_o ... erivatives

 

[Guest]

thank you, that helped a lot