Category: Mathematics
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The following is a study memo by the site owner on
ВА.Рохлин, Д.Б. Фукс
НАЧАЛЬНЫЙ КУРС ТОПОЛОГИИ
ГЕОМЕТРИЧЕСКИЕ ГЛАВЫ
ИЗДАТЕЛЬСТВО «НАУКА» Москва 1977For readers’ convenience, here is the original Russian edition.
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This “argument” is famous for being used to prove the commutativity of the fundamental groups of H-spaces, hence the commutativity of higher homotopy groups.
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A memo on flatness and projectivity of modules.
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Salvaged from mathoverflow.
Often considered as “elementary” and overlooked, but requires a complete understanding of definitions.
MMM 