Geodesic
Levels in algebra and topology.
Commentarii mathematici Helvetici, Tome 59 (1984), pp. 376-424 Cet article a éte moissonné depuis la source European Digital Mathematics Library

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Mots-clés : topological spaces with involution, level, colevel, sublevel, affine varieties, Hopf problem, equivariant maps, Stiefel manifolds, Borsuk-Ulam theorem, topology of spheres, arithmetic of sums of squares in rings, quadratic forms, Pythagoras number, invariants, Radon-Hurwitz number, isotropic form, ring of continuous functions, anisotropic form 
@article{CMH_1984__59_139983,
     author = {T.Y. Lam and Z.D. Dai},
     title = {Levels in algebra and topology.},
     journal = {Commentarii mathematici Helvetici},
     pages = {376--424},
     year = {1984},
     volume = {59},
     zbl = {0546.10017},
     url = {http://geodesic.mathdoc.fr/item/CMH_1984__59_139983/}
}
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T.Y. Lam; Z.D. Dai. Levels in algebra and topology.. Commentarii mathematici Helvetici, Tome 59 (1984), pp. 376-424. http://geodesic.mathdoc.fr/item/CMH_1984__59_139983/