Librería Samer Atenea
Librería Aciertas (Toledo)
Kálamo Books
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Librería Elías (Asturias)
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Librería Kolima (Madrid)
Librería Proteo (Málaga)
A new combinatorial foundation of the two concepts, based on a consideration of deep and classical results of homotopy theory, and an axiomatic characterization of the assumptions under which results in this field hold. Includes numerous explicit examples and applications in various fields of topology and algebra.