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单词 WeakHomotopyDoubleGroupoid
释义

weak homotopy double groupoid


Definition 0.1.

a weak homotopy double groupoidPlanetmathPlanetmath (WHDG) of acompactly–generated space Xcg, (weak Hausdorff space) isdefined through a construction method similar to that developed by R. Brown (ref. [1]) for the homotopy double groupoid of a Hausdorff space. The key changes here involve replacing the regular homotopy equivalence relationMathworldPlanetmath from the cited ref. with the weak homotopy equivalence relationMathworldPlanetmathPlanetmathPlanetmath in the definition of the fundamental groupoidMathworldPlanetmathPlanetmathPlanetmath, as well as replacing the Hausdorff space by the compactly-generated space Xcg. Therefore, the weak homotopyMathworldPlanetmathPlanetmath data for the weak homotopy double groupoid of Xcg, 𝝆(Xcg), will now be:

(𝝆2(X),𝝆1(X),1-,1+,+1,ε1),𝝆2(X),𝝆1(X),2-,2+,+2,ε2)(𝝆1(X),X,-,+,+,ε).

References

  • 1 R. Brown, K.A. Hardie, K.H. Kamps and T. Porter, A homotopy double groupoid of a Hausdorffspace, Theory and Applications of Categories 10,(2002): 71-93.
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更新时间:2025/5/4 9:17:14