Geodesic
The Lefschetz number of an involution on the space of classes of positive definite quadratic forms.
Commentarii mathematici Helvetici, Tome 56 (1981), pp. 272-296.

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Mots-clés : Euler-Poincare characteristic, fixpoint formula, quadratic forms, cohomology, symmetric space, singular cohomology, full congruence subgroup, explicit formula for Lefschetz number, fixpoint set of involution, noncommutative cohomology set, involution 
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     author = {J. Rohlfs},
     title = {The {Lefschetz} number of an involution on the space of classes of positive definite quadratic forms.},
     journal = {Commentarii mathematici Helvetici},
     pages = {272--296},
     publisher = {mathdoc},
     volume = {56},
     year = {1981},
     zbl = {0474.10019},
     url = {http://geodesic.mathdoc.fr/item/CMH_1981__56_139870/}
}
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J. Rohlfs. The Lefschetz number of an involution on the space of classes of positive definite quadratic forms.. Commentarii mathematici Helvetici, Tome 56 (1981), pp. 272-296. http://geodesic.mathdoc.fr/item/CMH_1981__56_139870/