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Publication:3785621
zbMath0643.57005MaRDI QIDQ3785621
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Publication date: 1987
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fundamental groupsecond homotopy groupprojective crossed module2- dimensional complex3-dimensional complex
Homotopy groups, general; sets of homotopy classes (55Q05) Fundamental group, presentations, free differential calculus (57M05)
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Mayer-Vietoris sequences in homotopy of 2-complexes and in homology of groups ⋮ Question de Whitehead et modules précroisés
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