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 Feb15 awarded Yearling Jan17 answered Galois group, algebraic closure over maximal extension Oct10 comment how to show a scalar product defined by trace of matrices is non-degenerate Part (b) is indeed correct, due to the fact that $A$ is assumed symmetric. Sep30 awarded Explainer Sep24 awarded Autobiographer Sep8 comment how to prove this group of the binary operation what have you tried? where did you get stuck? Aug29 revised Combinatorial interpretation of an equality deleted 11 characters in body Aug29 asked Combinatorial interpretation of an equality Aug24 answered Explanation for the number of partitions of $\{1,\dots,n\}$ into $k$ parts Jul18 comment Involutions of the second type in a division algebra Thanks for the comment. The answer, apparently, is that they sometimes exists and sometimes not- if your base field is local then there aren't any involutions of the second type. In a global setting one can construct an example, but only when the degree of the algebra is 2. In a more abstract setting- I don't know... Jul15 revised Topological group with discrete topology added 6 characters in body Jul15 comment Topological group with discrete topology Oh, I see what you mean.. I guess I've gotten too used to the topology of the product being assume to be the zarisky product. Regarding the last comment- nah.. I'll let the OP worry about that. Either he realizes it by himself or he proves that all topological groups are discrete. In my view it's a win-win situation :) Jul15 revised Topological group with discrete topology added 80 characters in body Jul15 comment Topological group with discrete topology Wait, @MartinBrandenburg .. are you sure about that? if you take $G=(\mathbb C,+)$ with the Zarisky topology, then $G$ is a topological group (since multiplication and inversion are polynomial mappings), but $\mathbb C$ is clearly $T_1$ and not $T_2$ with respect to Zarisky topology... Jul15 answered Topological group with discrete topology Jul15 comment Topological group with discrete topology Is the group $G$ assume Hausdorff? Jul14 revised Involutions of the second type in a division algebra added 4236 characters in body Jul14 asked Involutions of the second type in a division algebra Jul2 awarded Curious Jun6 awarded Popular Question