4 citations · 10 across the 10 of their papers we have counts for
4 papers · 2 filters
Curtis-Tits groups generalizing Kac-Moody groups of type
Rieuwert J. Blok, Corneliu Hoffman
In a previous paper we define a Curtis-Tits group as a certain generalization of a Kac-Moody group. We distinguish between orientable and non-orientable Curtis-Tits groups and iden…
Bass-Serre theory and counting rank two amalgams
Rieuwert J. Blok, Corneliu Hoffman
An amalgam of groups can be viewed as a Sudoku game inside a group. You are given a set of subgroups and their intersections and you need to decide what the largest group containin…
A classification of Curtis-Tits amalgams
Rieuwert Blok, Corneliu Hoffman
A celebrated theorem of Curtis and Tits on groups with finite BN-pair shows that roughly speaking these groups are determined by their local structure. This result was later extend…
On a Quasi-Phan Theorem for Orthogonal Groups
Corneliu Hoffman, Adam Roberts
This paper constructs a presentation for the orthogonal groups. The amalgam is contained in that constructed by Ralf Gramlich Hendrik Van Maldeghem and arXiv:0708.1583 but it's sho…