90intuition
Reputation
982
Top tag
Next privilege 1,000 Rep.
Create new tags
 Apr 21 awarded Notable Question Mar 7 awarded Notable Question Dec 15 awarded Yearling Nov 12 awarded Nice Question Nov 7 awarded Popular Question Oct 2 awarded Notable Question May 18 awarded Popular Question Mar 31 awarded Notable Question Jan 16 awarded Good Question Dec 15 awarded Yearling Dec 10 awarded Caucus Nov 19 awarded Popular Question Oct 9 revised Extending a pre-measure on an sigma-algebra? added 8 characters in body Oct 9 asked Extending a pre-measure on an sigma-algebra? Oct 9 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. Oct 9 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. Sep 18 awarded Popular Question Sep 6 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. Sep 6 asked Show that a simple ring is always an algebra over some field Aug 31 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