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math.GR1998
Free crossed resolutions of groups and presentations of modules of identities among relations
Ronald Brown, A. Razak Salleh
We give formulae for a module presentation of the module of identities among relations for a presentation of a group, in terms of information on 0- and 1-combings of the Cayley gra…
math.DG1998
Lie local subgroupoids and their holonomy and monodromy Lie groupoids
Ronald Brown, Ilhan Içen
The notion of local equivalence relation on a topological space is generalised to that of local subgroupoid. The main result is the construction of the holonomy and monodromy group…