Scott Carnahan
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 Jul 29 comment An equality for the dimension of the sum of subspaces (in the non-degenerate case) The OP has requested migration. Dec 21 awarded Constituent Dec 18 awarded Caucus Sep 25 answered On modules over simple rings Aug 11 comment Algebraic groups of multiplicative type in char 0 Yes, this is a basic descent argument. One reference is SGA 3 Exp. IX Proposition 2.1, but there might be others that are easier for non-specialists. Aug 11 comment Algebraic groups of multiplicative type in char 0 Any affine algebraic group is linear. This is covered near the beginning of most texts on algebraic groups. May 14 comment Multiplication of very Large Diagonal Matrix In the absence of structure on the diagonal entries, even reading the data takes $O(N)$ time, so I don't see how you expect a substantial improvement. Apr 30 comment Does the pullback of a covering space correspond to the pullback of the corresponding representation of $\pi_1$? You also want to equip your spaces with distinguished base points. Apr 23 comment Proof that a product of two quasi-compact spaces is quasi-compact without Axiom of Choice It looks like you are claiming that the $U$ you construct in the second paragraph is adequate, but I don't see it very clearly. In particular, there seems to be an implicit claim that $U \times X \subset W_1 \cup \cdots \cup W_n$. Apr 16 answered What is $\lim_{n\to\infty} \sum_{k=0}^{\lfloor n/2 \rfloor} \binom{n}{2k}\left(4^{-k}\binom{2k}{k}\right)^{\frac{2n}{\log_2{n}}}\,?$ Apr 9 awarded Excavator Apr 9 awarded Editor Apr 9 revised In the history of mathematics, has there ever been a mistake? Perko wrote me to request this correction. Apr 9 suggested approved edit on In the history of mathematics, has there ever been a mistake? Mar 12 comment On $\int_{-\infty}^{+\infty} {\frac{\tan(t-t_0)}{\cosh^2(t-t_0)} \cos(\omega t) \,\mathrm{d}t}$ How did this question arise? What have you tried? Jan 23 comment In the history of mathematics, has there ever been a mistake? @Zarrax Ken Perko vehemently denies having a PhD in math. Dec 12 answered Constructible set in Gieseker's 'Lectures on Moduli of Curves' Nov 6 awarded Yearling Sep 22 comment On a abelian representation of galois group It might help to think of the Galois group as a projective limit of finite groups coming from finite Galois extensions, instead of some abstract group of automorphisms of an algebraically closed field. Sep 17 answered Is a subring of an integral monoid ring an integral monoid ring?