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 Mar31 awarded Notable Question Jan16 awarded Good Question Dec15 awarded Yearling Dec10 awarded Caucus Nov19 awarded Popular Question Oct9 revised Extending a pre-measure on an sigma-algebra? added 8 characters in body Oct9 asked Extending a pre-measure on an sigma-algebra? Oct9 accepted Consider on $\Bbb{R}$ the family $\Sigma$ of all Borel sets which are symmetric w.r.t. the origin. Show that $\Sigma$ is a $\sigma$-algebra. Oct9 asked Consider on $\Bbb{R}$ the family $\Sigma$ of all Borel sets which are symmetric w.r.t. the origin. Show that $\Sigma$ is a $\sigma$-algebra. Sep18 awarded Popular Question Sep6 comment Show that a simple ring is always an algebra over some field @Hurkyl I think so. If it wouldn't be simple it would contain an nontrivial ideal, but then $R$ also has a nontrivial ideal. Sep6 asked Show that a simple ring is always an algebra over some field Aug31 comment Show that a division ring is simple. @MarkBennet oh wait.... like if $x$ in the ideal, then $x^{-1}\cdot x$ in the ideal, so everything in the ideal Aug31 asked Show that a division ring is simple. Jul2 awarded Curious Jun14 accepted How to solve:$\frac{3}{x-5}< \frac{7}{x-2}$ Jun14 comment How to solve:$\frac{3}{x-5}< \frac{7}{x-2}$ I like your writing style. Jun14 comment How to solve:$\frac{3}{x-5}< \frac{7}{x-2}$ Could I use your answer in a solution manual that I'm writing ? Jun14 comment How to solve:$\frac{3}{x-5}< \frac{7}{x-2}$ I think I can, but I wonder if I could simplify this as : $\dfrac{x-5}{3}> \dfrac{x-2}{7}$ Jun14 revised How to solve:$\frac{3}{x-5}< \frac{7}{x-2}$ added 60 characters in body