We call a module M , quasi-catenary if for each pair of quasi-prime submodules K and L of M with K L all saturated chains of quasi-prime submodules of M from K to L have a common finite length. We show that any homomorphic image of a quasi-catenary module is quasi-catenary. We prove that if M   is a module with following properties: (i) Every quasi-prime submodule of M has finite quasi-height;...

A unitarily invariant, complete Nevanlinna–Pick kernel K on the unit ball determines a class of operators Hilbert space called K-contractions. We study those K-contractions that are constrained, in sense they annihilated by an ideal multipliers. Our overarching goal is to identify various joint spectra these constrained through vanishing locus their annihilators. methods based around careful an...

In this paper we generalize the Skjelbred–Sund method, used to classify nilpotent Lie algebras, in order triple systems with non-zero annihilator. We develop method purpose of classifying systems, obtaining from it algebraic classification up dimension four. Additionally, obtain geometric variety

Double aggregation operators are introduced and several basic properties are studied, as neutral and annihilator elements, idempotency, etc., which are illustrated by some examples. The classes of additive and comonotone additive double aggregation operators are characterized.

This paper formulates the problem of determining the degrees of all polynomial entries in a minimal polynomial basis of a polynomial matrix by using only the degree structure of the given matrix. Using a block Toeplitz matrix structure corresponding to the given polynomial matrix, it is shown that the degrees of the elements in its minimal polynomial basis, in the generic case, depend only on t...

A new and conceptually simple procedure is derived for the computation of the maximal reachability submodule of a given submodule of the state space of a linear discrete time system over a Noethenian ring R. The procedure is effective if R is effective and if kernels and intersections can be computed. The procedure is compared with a rather different procedure by Assan e.a. published recently.

Let $R$ be a commutative ring with identity, $S$ multiplicatively closed subset of $R$, and $M$ an $R$-module.
 In this paper, we study investigate some properties $S$-primary submodules $M$. Among the other results, it is shown that this
 class modules contains family primary (resp. $S$-prime) properly.