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Math Help - Is there such a function?

  1. #1
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    Is there such a function?

    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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  2. #2
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    What is r? What are (f)yx and (f)x? Please use latex to make your question readable..
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  3. #3
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    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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