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19932026
most citedTraining Schrödinger's cat: quantum optimal control

779 citations

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math.GR2000★ 8 cited

Two-dimensional Artin groups with CAT(0) dimension three

Noel Brady, John Crisp

We exhibit 3-generator Artin groups which have finite 2-dimensional Eilenberg-Mac Lane spaces, but which do not act properly discontinuously by semi-simple isometries on a 2-dimens…

math.GR2000★ 38 cited

The solution to a conjecture of Tits on the subgroup generated by the squares of the generators of an Artin group

John Crisp, Luis Paris

It was conjectured by Tits that the only relations amongst the squares of the standard generators of an Artin group are the obvious ones, namely that a^2 and b^2 commute if ab=ba a…