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Название: Hopf spaces
Автор: Zabrodsky A.
Possibly more than any other field in mathematics algebraic topology-contains a vast amount of relatively simple facts, clusters of small theorems and intuitive observations. Naturally, these include many folklore-type theorems which So not appear in the literature. (It is quite likely that as many theorems in algebraic topology have appeared verbally in universities' common rooms as have appeared in print in the professional literature). It is therefore essential to bring some of these fundamentals to light in print from time to time.