English

A relaxed evaluation subgroup

Algebraic Topology 2010-02-11 v1

Abstract

Let f:XYf:X\to Y be a pointed map between connected CW-complexes. As a generalization of the evaluation subgroup G(Y,X;f)G_*(Y,X;f), we will define the {\it relaxed evaluation subgroup} G(Y,X;f){\mathcal G}_*(Y,X;f) in the homotopy group π(Y)\pi_*(Y) of YY, which is identified with Imπ(ev~){\rm Im} \pi_*(\tilde{ev}) for the evaluation map ev~:map(X,Y;f)×XY\tilde{ev} :map(X,Y;f)\times X\to Y given by ev~(h,x)=h(x)\tilde{ev} (h,x)=h(x). Especially we see by using Sullivan model in rational homotopy theory for the rationalized map f\Qf_{\Q} that G(Y\Q,X\Q;f\Q)=π(Y)\Q{\mathcal G}_*(Y_{\Q},X_{\Q};f_{\Q})=\pi_*(Y)\otimes \Q if the map ff induces an injection of rational homotopy groups. Also we compare it with more relaxed subgroups by several rationalized examples.

Keywords

Cite

@article{arxiv.1002.2032,
  title  = {A relaxed evaluation subgroup},
  author = {Toshihiro Yamaguchi},
  journal= {arXiv preprint arXiv:1002.2032},
  year   = {2010}
}

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first version

R2 v1 2026-06-21T14:45:24.922Z