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Rings and Algebras Problem set #12. Dec. 8, 2011. 1. Show that the exact sequence 0 A B C 0 is homotopic with the 0complex if and  
Summary: Rings and Algebras Problem set #12. Dec. 8, 2011. 

Source: Ágoston, István  Institute of Mathematics, Eötvös Loránd University 

Collections: Mathematics 