On the Lambek Invariants of Commutative Squares in a Quasi-Abelian Category
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invariantscategoriescommutativelambekquasi-abeliansquarescategoryconsider
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We consider the invariants Ker and Im for commutative squares in quasi-abelian categories. These invariants were introduced by Lambek for groups and then studied by Hilton and Nomura in exact categories.
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