Geodesic
The Cohomology of (Λ2 X, ΔX)
Canadian journal of mathematics, Tome 25 (1973) no. 5, pp. 908-921

Voir la notice de l'article provenant de la source Cambridge University Press

Let X be any connected C.W. complex. Let Λ2X be the 2-fold symmetric product of X, the set of unordered pairs (not necessarily distinct) of elements of X. Let ΔX ⊂ X2 be the diagonal, and also (by a slight abuse of notation) let ΔX ⊂ Λ2X also denote the set of unordered pairs {x, x}. 
Larmore, Lawrence L. The Cohomology of (Λ2 X, ΔX). Canadian journal of mathematics, Tome 25 (1973) no. 5, pp. 908-921. doi: 10.4153/CJM-1973-097-4
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