On Wednesday the 31st of January 2018 **Dr Lukasz Grabowski** (Lancaster University) visited Lincoln and gave a talk “*Quotients of groups by torsion elements*”.

*Abstract*: Our recent result with Gabor Elek deals with the variant of the “Halmos problem” for the rank metric. A particular case is as follows: if A and B are either unitary or self-adjoint matrices that almost commute with respect to the rank metric, then one can find commuting matrices C and D which are close in the rank metric to the matrices A and B respectively.

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