Geodesic
Heaps and unpointed stable homotopy theory
Archivum mathematicum, Tome 50 (2014) no. 5, pp. 323-332.

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In this paper, we show how certain “stability phenomena” in unpointed model categories provide the sets of homotopy classes with a canonical structure of an abelian heap, i.e. an abelian group without a choice of a zero. In contrast with the classical situation of stable (pointed) model categories, these sets can be empty.
DOI : 10.5817/AM2014-5-323
Classification : 55P42, 55U35
Keywords: stable homotopy; equivariant; fibrewise 
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Vokřínek, Lukáš. Heaps and unpointed stable homotopy theory. Archivum mathematicum, Tome 50 (2014) no. 5, pp. 323-332. doi : 10.5817/AM2014-5-323. http://geodesic.mathdoc.fr/articles/10.5817/AM2014-5-323/

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