. "2660"^^ . . . . . . "Twisted Poincar\u00E9 duality"@en . . . . . . . . . . . . . . . . . . . . "In mathematics, the twisted Poincar\u00E9 duality is a theorem removing the restriction on Poincar\u00E9 duality to oriented manifolds. The existence of a global orientation is replaced by carrying along local information, by means of a local coefficient system."@en . . . . . . . . . . . . . . . "In mathematics, the twisted Poincar\u00E9 duality is a theorem removing the restriction on Poincar\u00E9 duality to oriented manifolds. The existence of a global orientation is replaced by carrying along local information, by means of a local coefficient system."@en . . . . . "1016891464"^^ . "32182870"^^ . . . . . . . .