## $$\Delta$$-sets. I: Homotopy theory.(English)Zbl 0226.55019

### MSC:

 55U35 Abstract and axiomatic homotopy theory in algebraic topology 55U10 Simplicial sets and complexes in algebraic topology 55U15 Chain complexes in algebraic topology 55U40 Topological categories, foundations of homotopy theory

Zbl 0226.55020
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