Lam, T.Y., and Dai, Z.D.. "Levels in algebra and topology.." Commentarii mathematici Helvetici 59 (1984): 376-424. <http://eudml.org/doc/139983>.
@article{Lam1984, author = {Lam, T.Y., Dai, Z.D.}, journal = {Commentarii mathematici Helvetici}, keywords = {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}, pages = {376-424}, title = {Levels in algebra and topology.}, url = {http://eudml.org/doc/139983}, volume = {59}, year = {1984}, }
TY - JOUR AU - Lam, T.Y. AU - Dai, Z.D. TI - Levels in algebra and topology. JO - Commentarii mathematici Helvetici PY - 1984 VL - 59 SP - 376 EP - 424 KW - 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 UR - http://eudml.org/doc/139983 ER -
