in this paper‎, ‎we introduce the notion of $(m,n)$-‎algebr‎aically compact modules as an analogue of algebraically‎ ‎compact modules and then we show that $(m,n)$-algebraically‎ ‎compactness‎ ‎and $(m,n)$-pure injectivity for modules coincide‎. ‎moreover‎, ‎further characterizations of a‎ ‎$(m,n)$-pure injective module over a commutative ring are given‎.

Abstract Consider the Hamiltonian action of a torus on transversely symplectic foliation that is also Riemannian. When transverse hard Lefschetz property satisfied, we establish foliated version Kirwan injectivity theorem and use it to study actions Kähler foliations. Among other things, prove analogue Carrell–Liberman theorem. As an application, this confirms conjecture raised by Battaglia–Zaf...

We introduce a new model for simulating natural phenomena. We address several issues: topology, basic set properties like injectivity and surjectivity, reversibility, and decidability questions about a special kind of conservation law called grain conservation and ultimate periodicity.

It is known that the topological entropy for the geodesic flow on a Riemannian manifoldM is bounded if the absolute value of sectional curvature |KM | is bounded. We replace this condition by the condition of Ricci curvature and injectivity radius.

Given a smooth nonfocal compact Riemannian manifold, we show that the so-called Ma–Trudinger–Wang condition implies the convexity of injectivity domains. This improves a previous result by Loeper and Villani.