Blackboard Shots with Prefix "11_1100"

120227-171238: Non-surjectivity in the infinite case.

120207-182319: The surjectivity part.

120207-175525: An injectivity proof (2).

120207-174409: An injectivity proof.

111028-115309: Landau's function.

111024-110239: Extending a Sylow-p group by a p-group.