Closedness properties of internal relations IV: Expressing additivity of a category via subtractivity

Details Closedness properties of internal relations IV: Expressing additivity of a category via subtractivity Closedness properties of internal relations IV: Expressing additivity of a category via subtractivity

2006-10-03

arxiv.org/abs/math/0610110v1

Mathematics

Category Theory

to be published in "Journal of Homotopy and Related Structures"

Scientific paper

The notion of a subtractive category, recently introduced by the author, is a ``categorical version'' of the notion of a (pointed) subtractive variety of universal algebras, due to A. Ursini. We show that a subtractive variety $\C$, whose theory contains a unique constant, is abelian (i.e. $\C$ is the variety of modules over a fixed ring), if and only if the dual category $\C^\mathrm{op}$ of $\C$, is subtractive. More generally, we show that $\C$ is additive if and only if both $\C$ and $\C^\mathrm{op}$ are subtractive, where $\C$ is an arbitrary finitely complete pointed category, with binary sums, and such that each morphism $f$ in $\C$ can be presented as a composite $f=me$, where $m$ is a monomorphism and $e$ is an epimorphism.

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