We introduce center-like subsets Z*(R,f), Z**(R,f) and Z1(R,f), where R is a ring and f is a map from R to R. For f a derivation or a non-identity epimorphism and R a suitably-chosen prime or semiprime ring, we prove that these sets coincide with the center of R.

Linguistic and psycholinguistic research has documented that there exists a close relationship between a verb’s meaning and the syntactic structures in which it occurs, and that learners and comprehenders take advantage of this relationship both in acquisition and in processing. We address implications of these facts for issues in structural ambiguity resolution, arguing that comprehenders are ...

Let M be a smooth manifold and let F be a codimension one, C foliation on M , with isolated singularities of Morse type. The study and classification of pairs (M,F) is a challenging (and difficult) problem. In this setting, a classical result due to Reeb [Reeb] states that a manifold admitting a foliation with exactly two centertype singularities is a sphere. In particular this is true if the f...

Abstract Consider a Shimura variety of Hodge type admitting smooth integral model S at an odd prime $$p\ge 5$$ p ≥ 5 . its perfectoid cover $$S^{\text {ad}}(p^\infty )$$ S ad (</mml:...

we introduce center-like subsets z*(r,f), z**(r,f) and z1(r,f), where r is a ring and f is a map from r to r. for f a derivation or a non-identity epimorphism and r a suitably-chosen prime or semiprime ring, we prove that these sets coincide with the center of r.

Saliency detection aims to detect the most attractive objects in images, which has been widely used as a foundation for various multimedia applications. In this paper, we propose a novel salient object detection algorithm for RGB-D images using center-dark channel prior. First, we generate an initial saliency map based on a color saliency map and a depth saliency map of a given RGB-D image. The...

The MIPAS instrument has provided unprecedented information on the distribution and composition of polar stratospheric clouds. Both the spectral information in the measured data and its views of the poles are central to these advances. In this paper, the detection of polar stratospheric cloud particles is discussed and a threshold value of five for a defined MIPAS cloud index is shown to be sui...

In this paper, we prove that a non-Riemannian isotropic Berwald metric or a non-Riemannian (α,β) -metric admits no concurrent vector fields. We also prove that an L-reducible Finsler metric admitting a concurrent vector field reduces to a Landsberg metric.In this paper, we prove that a non-Riemannian isotropic Berwald metric or a non-Riemannian (α,β) -metric admits no concurrent vector fi...