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 Dec16 awarded Caucus Nov25 comment The Stupid Computer Problem : can every polynomial be written with only one $x$? @DavidSpeyer Well how about that. You're absolutely right. Noted above. Nov25 revised The Stupid Computer Problem : can every polynomial be written with only one $x$? Point out error. Nov25 revised The Stupid Computer Problem : can every polynomial be written with only one $x$? Fixed typo. Nov24 awarded Critic Nov24 comment The Stupid Computer Problem : can every polynomial be written with only one $x$? This is a very bad typo. You are completely correct. Thanks for catching that! Should be fixed now. Nov24 revised The Stupid Computer Problem : can every polynomial be written with only one $x$? Typo: added exponent of m to first expression. Nov23 answered The Stupid Computer Problem : can every polynomial be written with only one $x$? Oct29 answered Show that if $X$ may be deformed into $Z$ then $X$ and $Z$ are cobordant. Oct29 comment Nested Sum Encountered in Maclaurin Expansion of $e^{-x^2}$ almagest, your reformulation inspired me and I finally figured it out! See the answer I posted if you want to see the nitty-gritty details. Thanks! Oct29 answered Nested Sum Encountered in Maclaurin Expansion of $e^{-x^2}$ Sep17 awarded Supporter Sep17 comment Necessary and Sufficient Conditions for $f_{xy} = f_{yx}$ You are correct. I misinterpreted what you were attempting to say. However, this is a simple restatement of the original theorem. In a sense, I'm asking that if we declare the mixed partials to be equal, then what can we deduce about $f$? Also, see my original post, edited to ask about some relevant illustrative examples. Sep17 revised Necessary and Sufficient Conditions for $f_{xy} = f_{yx}$ added 306 characters in body Sep17 comment Necessary and Sufficient Conditions for $f_{xy} = f_{yx}$ The construction of $f$ there is clever. Thank you. Sep17 comment Necessary and Sufficient Conditions for $f_{xy} = f_{yx}$ @Graham, nice formatting. However, the "change of order" step is only valid assuming continuity of second partials. You accidentally included a bit of your conclusion in your premise. Sep17 revised Necessary and Sufficient Conditions for $f_{xy} = f_{yx}$ edited title Sep17 asked Necessary and Sufficient Conditions for $f_{xy} = f_{yx}$ Sep4 awarded Yearling Sep3 awarded Editor