Resultats globals: 3 registres trobats en 0.02 segons.
Articles, 3 registres trobats
Articles 3 registres trobats  
1.
10 p, 280.1 KB Iteration of functions and contractibility of acyclic 2-complexes / Leary, Ian J. (University of Southampton. School of Mathematical Sciences.)
We show that there can be no algorithm to decide whether infinite recursively described acyclic aspherical 2-complexes are contractible. We construct such a complex that is contractible if and only if the Collatz conjecture holds.
2021 - 10.5565/PUBLMAT6512110
Publicacions matemàtiques, Vol. 65 Núm. 1 (2021) , p. 309-318 (Articles)  
2.
38 p, 6.6 MB Exact sequences for mixed coproduct/tensor-product ring constructions / Dicks, Warren 1947- ; Leary, Ian J
To a commutative ring K, and a family of K-algebras indexed by the vertex set of a graph, we associate a K-algebra obtained by a mixture of coproduct and tensor product constructions. For this, and related constructions, we give exact sequences and deduce homological properties.
1994 - 10.5565/PUBLMAT_38194_09
Publicacions matemàtiques, Vol. 38, Núm. 1 (1994) , p. 89-126  
3.
6 p, 108.9 KB Bounding the orders of finite subgroups / Leary, Ian J. ; Nucinkis, Brita E. A.
We give homological conditionson groups such that whenever the conditions hold for a group G, there is a bound on the orders of finite subgroups of G. This extends a result of P. H. Kropholler. We also suggest a weaker condition under which the same conclusion might hold.
2001 - 10.5565/PUBLMAT_45101_13
Publicacions matemàtiques, V. 45 N. 1 (2001) , p. 259-264  

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1 Leary, Ian J
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