Some remarks on the Whitehead asphericity conjecture

被引:1
|
作者
Ivanov, SV [1 ]
机构
[1] Univ Illinois, Dept Math, Urbana, IL 61801 USA
关键词
D O I
10.1215/ijm/1256060692
中图分类号
O29 [应用数学];
学科分类号
070104 ;
摘要
The Whitehead asphericity conjecture claims that if (A\\R) is an aspherical group presentation, then for every S subset of R the subpresentation (A\\S) is also aspherical. It is proven that if the Whitehead conjecture is false then there is an aspherical presentation E = [A\\R U {z}] of the trivial group E, where the alphabet A is finite or countably infinite and z is an element of A, such that its subpresentation [A\\R] is not aspherical. It is also proven that if the Whitehead conjecture fails for finite presentations (i.e., with finite A and R) then there is a finite aspherical presentation [A\\R], R = {R-1, R-2, ..., R-n}, such that for every S subset of or equal to R the subpresentation (A\\S) is aspherical and the subpresentation [A\\R1R2, R-3, ..., R-n] of aspherical [A\\R-1 R-2, R-2, R-3, ..., R-n] is not aspherical.
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页码:793 / 799
页数:7
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