Let k be an integral domain containing the invertible elements α, s and 1 s−s −1 . If M is an oriented 3-manifold, let K(M) denote the Kauffman skein module of M over k. Based on the work on Birman-Murakami-Wenzl algebra by Beliakova and Blanchet [2], we give an “idempotent-like” basis for the Kauffman skein module of handlebodies. Gilmer and Zhong [6] have studied the Homflypt skein modules of...

Let k be a field and G a finite group. By analogy with the theory of phantom maps in topology, a map f : M → N between kG-modules is said to be phantom if its restriction to every finitely generated submodule of M factors through a projective module. We investigate the relationships between the theory of phantom maps, the algebraic theory of purity, and Rickard’s idempotent modules. In general,...

In this paper, we are mainly concerned with the Cartan determinant conjecture and the no loop conjecture. If A is an artin algebra of finite global dimension, the first conjecture claims that the Cartan determinant of A is equal to 1, while the second one states that every simple A-module admits only the trivial self-extension. Among numerous partial solutions to these conjectures such as those...

We fully characterise the solvability of Rado equations inside linear combinations $a_{1}\U\oplus\dots\oplus a_{n}\U$ idempotent ultrafilters $\U\in\beta\Z$ by exploiting known relations between such and strings integers. This generalises a partial characterization previously obtained Mauro Di Nasso.

This paper proposes a set of modularisation constructs as well as a new implementation technique for overloading functions across module boundaries. In contrast to existing approaches, it allows to fully preserve separation of namespaces and it supports overloading of recursive functions in the context of subtyping, which in fact requires support for mutual recursion across module boundaries. B...

Let R be a ring with identity, M right R-module and F fully invariant submodule of M. The concept an F-inverse split module has been investigated recently. In this paper, we approach to different perspective, that is, deal notion F-image M, study various properties obtain some characterizations kind modules. By means modules focus on in which submodules are dual Rickart direct summands. way, co...

in this paper, we introduce the notion of multiplier in -algebra and study relationships between multipliers and some special mappings, likeness closure operators, homomorphisms and ( -derivations in -algebras. we introduce the concept of idempotent multipliers in bl-algebra and weak congruence and obtain an interconnection between idempotent multipliers and weak congruences. also, we introduce...

Recollements of abelian, resp. triangulated, categories are exact sequences of abelian, resp. triangulated, categories where the inclusion functor as well as the quotient functor have left and right adjoints. They appear quite naturally in various settings and are omnipresent in representation theory. Recollements which all categories involved are module categories (abelian case) or derived cat...

A ring R is called right strong stably finite (r.ssf) if for all n ≥ 1, injective endomorphisms of R (n) R are essential. If R is an r.ssf ring and e is an idempotent of R such that eR is a retractable R-module, then eRe is an r.ssf ring. A direct product of rings is an r.ssf ring if and only if each factor is so. The R.ssf condition is investigated for formal triangular matrix rings. In partic...

In this paper, we give an explicit characterization of isomorphic finitely presented modules in terms of certain inflations of their presentation matrices. In particular cases, this result yields a characterization of isomorphic modules as the completion problem characterizing Serre’s reduction, i.e., of the possibility to find a presentation of the module defined by fewer generators and fewer ...