集中于2度的同伦群上运算的可实现性
The realizability of operations on homotopy groups concentrated in two degrees
摘要:
空间的同伦群被赋予同伦运算,这些同伦运算定义了空间的n-代数。一个Eilenberg-MacLane空间是一个集中在一个度上的子代数的实现。本文给出了集中于两个度上的一个可实现代数可实现的充要条件。然后,我们专门研究稳定的情况,并列出无限族的这种不可实现的代数。
英文摘要:
The homotopy groups of a space are endowed with homotopy operations which define the Π-algebra of the space. An Eilenberg-MacLane space is the realization of a Π-algebra concentrated in one degree. In this paper, we provide necessary and sufficient conditions for the realizability of a Π-algebra concentrated in two degrees. We then specialize to the stable case, and list infinite families of such Π-algebras that are not realizable.
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