Presentations of the first homotopy groups of the unitary groups

Presentations of the first homotopy groups of the unitary groups
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DOI:
10.1007/s00014-003-0770-0
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发表时间:
2003-01
影响因子:
0.9
通讯作者:
T. Püttmann;A. Rigas
T. Püttmann;A. Rigas
中科院分区:
数学2区
文献类型:
--
作者:
T. Püttmann;A. Rigas

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给出了酉群的所有稳定群和第一非稳定同伦群的显式表示。特别地,对于每个n≥2,我们提供了每个表示(n- 1)!- π2nSU(n)≈n!的合适发生器的功率。这些交换映射的乘积是到单位矩阵的常数映射。
We describe explicit presentations of all stable and the first nonstable homotopy groups of the unitary groups. In particular, for eachn≥ 2 we supplynhomotopic maps that each represent the (n- 1)!-th power of a suitable generator of π2nSU(n) ≈ ℤn!. The product of thesencommuting maps is the constant map to the identity matrix.