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Dec
16
awarded  Caucus
Nov
25
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.
Nov
25
revised The Stupid Computer Problem : can every polynomial be written with only one $x$?
Point out error.
Nov
25
revised The Stupid Computer Problem : can every polynomial be written with only one $x$?
Fixed typo.
Nov
24
awarded  Critic
Nov
24
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.
Nov
24
revised The Stupid Computer Problem : can every polynomial be written with only one $x$?
Typo: added exponent of m to first expression.
Nov
23
answered The Stupid Computer Problem : can every polynomial be written with only one $x$?
Oct
29
answered Show that if $X$ may be deformed into $Z$ then $X$ and $Z$ are cobordant.
Oct
29
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!
Oct
29
answered Nested Sum Encountered in Maclaurin Expansion of $e^{-x^2}$
Sep
17
awarded  Supporter
Sep
17
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.
Sep
17
revised Necessary and Sufficient Conditions for $f_{xy} = f_{yx}$
added 306 characters in body
Sep
17
comment Necessary and Sufficient Conditions for $f_{xy} = f_{yx}$
The construction of $f$ there is clever. Thank you.
Sep
17
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.
Sep
17
revised Necessary and Sufficient Conditions for $f_{xy} = f_{yx}$
edited title
Sep
17
asked Necessary and Sufficient Conditions for $f_{xy} = f_{yx}$
Sep
4
awarded  Yearling
Sep
3
awarded  Editor