فهرست نشریات علمی دسترسی آزاد ایران

In this paper, some Baer type criteria are considered for locally presentable categories. Recalling the notion of the classical Baer criterion for injectivity, it is shown that a locally presentable category which has enough injectives and coproduct injections, which are monomorphisms, satisfy such criterion if and only if the class of its injective objects is accessibly embedded in the category. Also, it is shown that this criterion is equivalent to the Baer type criterion that injectivity is equivalent to injectivity with respect to a subclass of monomorphisms.It is also proved some Baer type criteria for $\lambda$-presentable categories for injectivity with respect to monomorphisms with $\lambda$-presentable domains and codomains, for a regular cardinal number $\lambda$.In particular, some Baer type criteria is found for varieties.