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13:00, 8 May 2015 (diff | hist) . . (+179)‎ . . N Notes for BBS/Martins-150501-114927.jpg ‎ (Created page with "Bottom left correct relation is <math>(X,e)(Y,f)(X,e)^{-1}</math> (second axiom of crossed modules). Fourth red relation on the right should be <math>D=\partial(d)A^{-1}GA</m...") (top)

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