Equivariant Euler characteristics of partition posets
We compute all the equivariant Euler characteristics of the $Σ_n$-poset of partitions of the $n$ element set.
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arXiv subjects
Jesper M. Moller
Publications and source records attributed to Jesper M. Moller.
Euler characteristics of p-subgroup categories
We compute Euler characteristics of p-subgroup categories of finite groups
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Can one classify finite Postnikov pieces?
We compare the classical approach of constructing finite Postnikov systems by k-invariants and the global approach of Dwyer, Kan, and Smith. We concentrate on the case of 3-stage Postnikov pieces and provide examples where a classification is feasible. In general though the computational difficulty of the global approach is equivalent to that of the classical one.
math.AT↗