We prove a variation on the Seifert-van Kampen theorem in a setting of non-abelian categorical algebra, providing sufficient conditions on a functor F, from an algebraically coherent semi-abelian category with enough projectives to an almost abelian (= Raikov semiabelian) category, for the preservation of pushouts of split monomorphisms by the left derived functor of F.
机构:
Univ Johannesburg, Dept Math & Appl Math, Kingsway Campus,POB 524, ZA-2006 Auckland Pk, South AfricaUniv Johannesburg, Dept Math & Appl Math, Kingsway Campus,POB 524, ZA-2006 Auckland Pk, South Africa
Goswami, Amartya
Janelidze, Zurab
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机构:
Stellenbosch Univ, Dept Math Sci, Div Math, Private Bag X1, ZA-7602 Matieland, South AfricaUniv Johannesburg, Dept Math & Appl Math, Kingsway Campus,POB 524, ZA-2006 Auckland Pk, South Africa