Artículos de revistas
Presentations of the first homotopy groups of the unitary groups
Registro en:
Commentarii Mathematici Helvetici. Birkhauser Verlag Ag, v. 78, n. 3, n. 648, n. 662, 2003.
0010-2571
WOS:000184897900011
10.1007/s00014-003-0770-0
Autor
Puttmann, T
Rigas, A
Institución
Resumen
We describe explicit presentations of all stable and the first nonstable homotopy groups of the unitary groups. In particular, for each n greater than or equal to 2 we supply n homotopic maps that each represent the (n - 1)!-th power of a suitable generator of pi(2n)SU(n) approximate to Z(n!). The product of these n commuting maps is the constant map to the identity matrix. 78 3 648 662