Geodesic
On L2-Betti Numbers for Abelian Groups
Canadian mathematical bulletin, Tome 24 (1981) no. 1, pp. 91-95

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

Let M be a differentiable manifold which admits the free action of a group Γ with compact quotient M’ = M/Γ. Suppose that the Γ action lifts to a Hermitian vector bundle E→M. If Γ leaves invariant a measure μ on M, then denote by L2(E) the completion of with respect to the inner product . 
Donnelly, Harold. On L2-Betti Numbers for Abelian Groups. Canadian mathematical bulletin, Tome 24 (1981) no. 1, pp. 91-95. doi: 10.4153/CMB-1981-014-7
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