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Axiom TR BBD.svg LaTeX source documentclass amsart usepackage amsmath amssymb nopageno usepackageall xy begin document begin equation xymatrix em Z' arrrddd arrruuu arrruuu arrrd Y' arrrddd arrru arrru arrrrrdd arrruuu arrrrruu circ X' arrrddd arrrd end equation end document talk File Octahedral diagram deligne svg File