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 Apr 19 comment Is there a way of defining the notion of a variable mathematically? I think I understand what you are getting at. If we take an informal expression with variables and make it formal ala metamath, we would get some string of symbols involving those variables, which is just a string in some formal language. Thus, in the language of metamath, a variable is any greek and roman letter that appears in a string of that language. Apr 18 asked Is there a way of defining the notion of a variable mathematically? Apr 18 revised The topology of distributions deleted 59 characters in body Apr 18 asked The topology of distributions Apr 10 comment About the notation of the probability measures It should be since $P^{X_n}$ is a measure on the image space of $X_n$. Apr 6 accepted Given $\int_0^x f(t) \, dt = 2\cos x + 3x + 2,$ find $f$ Apr 6 comment Given $\int_0^x f(t) \, dt = 2\cos x + 3x + 2,$ find $f$ You are absolutely right. Thank you for pointing this out. Apr 6 comment Given $\int_0^x f(t) \, dt = 2\cos x + 3x + 2,$ find $f$ It didn't occur to me to check the first equation. I knew something was fishy. I am convinced that it is a typo. Thanks. Apr 6 asked Given $\int_0^x f(t) \, dt = 2\cos x + 3x + 2,$ find $f$ Feb 3 accepted Characters and permutation matrices Feb 2 comment Characters and permutation matrices Are saying that because the permutation representation is reducible, $\chi$ is not a bonafide "character"? Feb 2 comment Characters and permutation matrices So you are saying that it should be $\chi(gg^{-1})=\chi(g)+\chi(g^{-1})$? And what do you mean by "characters of degree 1"? Aren't all characters one-dimensional representations? Feb 2 asked Characters and permutation matrices Dec 14 accepted dy/dx when x and y are functions Dec 14 asked Generalization of manifold Dec 14 accepted Edge coloring of a $k$-regular bipartite graph Dec 14 comment Edge coloring of a $k$-regular bipartite graph I do not mind using Hall's marriage theorem. This is really neat. Thanks a lot. Dec 14 accepted Rigorous Proof of the Principle of Counting Dec 14 answered Samples and random variables Nov 22 awarded Nice Question