arXiv subjects

Qiu Jin

Publications and source records attributed to Qiu Jin.

4 recordsLinked to original sources

arXiv2024

Stratified L-convex groups

This paper investigates a novel structure of stratified L-convex groups, defined as groups possessing stratified L-convex structures, in which the group operations are L-convexity-preserving mappings. It is verified that stratified L-convex groups serve as objects, while L-convexity-preserving group homomorphisms serve as morphisms, together forming a concrete category, denoted as SLCG. As a specific instance of SLCG (i.e., when L=2), the category of convex groups, denoted as CG, is also defined. We show that CG can be embedded within SLCG as a reflective subcategory. In addition, we demonstrate that SLCG possesses well-defined characterizations, localization properties, and initial and final structures, establishing it as a topological category over groups.

math.GN↗

arXiv2024

The further study on the category of T-convergence groups

T-convergence groups is a natural extension of lattice-valued topological groups, which is a newly introduced mathematical structure. In this paper, we will further explore the theory of T-convergence groups. The main results include: (1) It possesses a novel characterization through the $\odot$-product of T-filters, and it is localizable, meaning that each T-convergence group is uniquely determined by the convergence at the identity element of the underlying group. (2) The definition of its subcategory, the topological T-convergence groups, can be simplified by removing the topological condition (TT). (3) It exhibits uniformization, which means that each T-convergence group can be reconstructed from a T-uniformly convergent space. (4) It possesses a power object, indicating that it has good category properties.

math.LO↗

arXiv2024

A novel axiomatic approach to L-valued rough sets within an L-universe via inner product and outer product of L-subsets

The fuzzy rough approximation operator serves as the cornerstone of fuzzy rough set theory and its practical applications. Axiomatization is a crucial approach in the exploration of fuzzy rough sets, aiming to offer a clear and direct characterization of fuzzy rough approximation operators. Among the fundamental tools employed in this process, the inner product and outer product of fuzzy sets stand out as essential components in the axiomatization of fuzzy rough sets. In this paper, we will develop the axiomatization of a comprehensive fuzzy rough set theory, that is, the so-called L-valued rough sets with an L-set serving as the foundational universe (referred to as the L-universe) for defining L-valued rough approximation operators, where L typically denotes a GL-quantale. Firstly, we give the notions of inner product and outer product of two L-subsets within an L-universe and examine their basic properties. It is shown that these notions are extensions of the corresponding notion of fuzzy sets within a classical universe. Secondly, leveraging the inner product and outer product of L-subsets, we respectively characterize L-valued upper and lower rough approximation operators generated by general, reflexive, transitive, symmetric, Euclidean, and median L-value relations on L-universe as well as their compositions. Finally, utilizing the provided axiomatic characterizations, we present the precise examples for the least and largest equivalent L-valued upper and lower rough approximation operators. Notably, many existing axiom characterizations of fuzzy rough sets within classical universe can be viewed as direct consequences of our findings.

math.LO↗

arXiv2013

Eliminating cracking during drying

When colloidal suspensions dry, stresses build up and cracks often occur - a phenomenon undesirable for important industries such as paint and ceramics. We demonstrate an effective method which can completely eliminate cracking during drying: by adding emulsion droplets into colloidal suspensions, we can systematically decrease the amount of cracking, and eliminate it completely above a critical droplet concentration. Since the emulsion droplets eventually also evaporate, our technique achieves an effective function while making little changes to the component of final product, and may therefore serve as a promising approach for cracking elimination. Furthermore, adding droplets also varies the speed of air invasion and provides a powerful method to adjust drying rate. With the effective control over cracking and drying rate, our study may find important applications in many drying and cracking related industrial processes.

physics.flu-dyn↗