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A labelled oriented graph (LOG) group is a group given by a presentation constructed in a certain way from a labelled oriented graph: examples include Wirtinger presentations of knot groups. We show how to obtain generators for the Schur Multiplier $$H_2(G)$$ H 2 ( G ) of a LOG group from the underlying LOG, and by exhibiting the n-string braid group $$B_n$$ B n as a LOG...
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