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Directed homotopy theory, II. Homotopy constructs
Theory and applications of categories, Tome 10 (2002), pp. 369-391
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Directed Algebraic Topology studies phenomena where privileged directions appear, derived from the analysis of concurrency, traffic networks, space-time models, etc.

This is the sequel of a paper, `Directed homotopy theory, I. The fundamental category', where we introduced directed spaces, their non reversible homotopies and their fundamental category. Here we study some basic constructs of homotopy, like homotopy pushouts and pullbacks, mapping cones and homotopy fibres, suspensions and loops, cofibre and fibre sequences.

Classification : 55P99, 18G55.
Keywords: homotopy theory, homotopical algebra, directed homotopy, homotopy pushouts, homotopy pullbacks, mapping cones, homotopy fibres. 
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     author = {Marco Grandis},
     title = {Directed homotopy theory, {II.} {Homotopy} constructs},
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     year = {2002},
     volume = {10},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/TAC_2002_10_a13/}
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Marco Grandis. Directed homotopy theory, II. Homotopy constructs. Theory and applications of categories, Tome 10 (2002), pp. 369-391. http://geodesic.mathdoc.fr/item/TAC_2002_10_a13/