Notions of enriched purity

Abstract

We introduce enriched notions of purity depending on the left class $\mathcal{E}$ of a factorization system on the base $\mathcal{V}$ of enrichment. Ordinary purity is given by the class of surjective mappings in the category of sets. Under specific assumptions, covering enrichment over quantale-valued metric spaces, $\omega$-complete posets, and quasivarieties, we characterize the $(\lambda ,\mathcal{E})$-injectivity classes of locally presentable $\mathcal{V}$-categories in terms of closure under a class of limits, $\lambda$-filtered colimits, and $(\lambda ,\mathcal{E})$-pure subobjects.

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