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On Parallelizable Spheres in Semi Euclidean Space
(SOUTHEAST ASIAN MATHEMATICAL SOC-SEAMS, 2020)In Euclidean space, there exist four theorems which show that S-n sphere is not parallelizable for n not equal 1, 3, 7. While three of them are shown by using Bott theorem, the last one is shown by using Hurwitz-Radon ...