Dually, a morphism f an HomeCX, Y) is called injectively trivial if for each object Zee, the induced map Exte(Z, f) : Extg(Z, X) -* Exte(Z, Y) is the zero map. In the following it is convenient to write rjf for the pullback Exte(/aquot;, Z)(-n) of 7} along f, anbsp;...

Title | : | Boletín de la Sociedad Matemática Mexicana |

Author | : | |

Publisher | : | - 2003 |

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