Talk:Boundary of Polygon is Jordan Curve

While concatenation is associative up to homotopy, it's not strictly associative. It appears in the penultimate line that a particular choice for the parentheses has been made. This needs to be addressed in one way or another. --Lord_Farin (talk) 17:40, 7 February 2013 (UTC)


 * The exact order of the concatenation is now shown. It looks clumsy - perhaps the best solution would be to write a lemma, showing that the concatenation of simple paths that do not cross is also simple. --Anghel (talk) 19:59, 7 February 2013 (UTC)