PROVIDENCE, Rhode Island, Feb. 21 -- Proceedings of the American Mathematical Society, a peer-reviewed journal that says it features applied mathematics, published research articles, including the following topics, in its Vol. 151, No. 4 edition:

* A categorical study on the generalized type semigroup

* A partial converse ghost lemma for the derived category of a commutative Noetherian ring

* Axial constants and sectional regularity of homogeneous ideals