is there a function f: A (subset of R^n) -> r such that (f)yx exists on R^2 but (f)x exists nowhere?
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What is r? What are (f)yx and (f)x? Please use latex to make your question readable..
Sorry. I should really learn to use LaTex. It's R -the set of real numbers. that was a typo.
And fx - partial derivatve wrt x.
(f)yx - mixed artial derivaive of f.
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