Browsing by Author "Zhang, Xia"

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    Injective hulls of many-sorted ordered algebras
    (2019) Zhang, Xia; Ma, Wen; Rump, Wolfgang
    This paper is devoted to the study of injectivity for ordered universal algebras. We first characterize injectives in the category OALΣ⩽of ordered Σ -algebras with lax morphisms as sup- Σ -algebras. Second, we show that every ordered Σ -algebra has an σ ⩽ -injective hull, and give its concrete form.