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Oct
13
comment Direct sum of Prüfer groups and $\mathbb Q/\mathbb Z$
Look up profinite completions and Pontryagin duality.
Sep
15
comment Inequality: $7a+5b+12ab\le9$
Think geometry.
Sep
15
comment Intersection of distinct maximal subgroups in a finite simple group
More is true: If every proper subgroup of a finite group is nilpotent, then the group is solvable. This is the Schmidt-Iwasawa theorem.
Sep
14
answered A presentation for $\mathbb Q_8\rtimes_{\phi}\mathbb Z_3$?
Sep
2
awarded  Supporter
Sep
1
answered Profinite completion of Special linear group
Sep
3
awarded  Teacher
Sep
3
answered Finite subgroups of orthogonal transformations in $\mathbb{R}^3$