Scott Carnahan
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 Dec21 awarded Constituent Dec18 awarded Caucus Sep25 answered On modules over simple rings Aug11 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. Aug11 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. May14 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. Apr30 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. Apr23 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 $U \times X \subset W_1 \cup \cdots \cup W_n$. Apr16 answered What is $\lim_{n\to\infty} \displaystyle \sum_{k=0}^{\lfloor n/2 \rfloor} \binom{n}{2k}\left(4^{-k}\binom{2k}{k}\right)^{\frac{2n}{\log_2{n}}}\,?$ Apr9 awarded Excavator Apr9 awarded Editor Apr9 revised In the history of mathematics, has there ever been a mistake? Perko wrote me to request this correction. Apr9 suggested approved edit on In the history of mathematics, has there ever been a mistake? Mar12 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? Jan23 comment In the history of mathematics, has there ever been a mistake? @Zarrax Ken Perko vehemently denies having a PhD in math. Dec12 answered Constructible set in Gieseker's 'Lectures on Moduli of Curves' Nov6 awarded Yearling Sep22 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. Sep17 answered Is a subring of an integral monoid ring an integral monoid ring? Sep10 comment Monotonic log det function? What is $\sigma$?