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Chain homotopy.svg LaTeX source documentclass amsart usepackage amsmath amssymb nopageno usepackageall xy begin document begin equation xymatrix em dots arr dA arr dA ar ar ardl scriptstyle arr dA ar ar ardl scriptstyle arr dA ar ar ardl scriptstyle dots ardl scriptstyle dots arr dB arr dB arr dB arr dB dots end equation end