Su alcuni invarianti numerici associati a sistemi di equazioni lineari in un modulo
Su una classe di gruppi con molti sottogruppi quasinormali
Subadditive functions on modules and subgroups of abelian groups.
Subalgebra lattices of unary algebras and an axiom of choice
Subalgebra modular, distributive and boolean varieties of semigroups
Subalgebras of diagonalizable algebras of theories containing arithmetic [Book]
Subdirect decomposition of distributive quasilattices
Subdirect decompositions and the radical of a generalized Boolean algebra extension of a lattice ordered group
The extension of a lattice ordered group by a generalized Boolean algebra will be denoted by . In this paper we apply subdirect decompositions of for dealing with a question proposed by Conrad and Darnel. Further, in the case when is linearly ordered we investigate (i) the completely subdirect decompositions of and those of , and (ii) the values of elements of and the radical .
Subdirect decompositions of algebras from 2-clone extensions of varieties
Let τ:F → ℕ be a type of algebras, where F is a set of fundamental operation symbols and ℕ is the set of nonnegative integers. We assume that |F|≥2 and 0 ∉ (F). For a term φ of type τ we denote by F(φ) the set of fundamental operation symbols from F occurring in φ. An identity φ ≉ ψ of type τ is called clone compatible if φ and ψ are the same variable or F(φ)=F(ψ)≠. For a variety V of type τ we denote by the variety of type τ defined by all identities φ ≉ ψ from Id(V) which are either clone compatible...
Subdirect product decompositions of -algebras
Subdirect products of chains
Subdirect representation of tight Riesz groups by hybrid products.
Subdirectly irreducible algebras of quasiordered logics
Subdirectly irreducible and congruence distributive -lattices
Subdirectly irreducible decomposition of some algebras having the semilattice structure
Subdirectly irreducible MV-algebras
In this note we characterize the one-generated subdirectly irreducible MV-algebras and use this characterization to prove that a quasivariety of MV-algebras has the relative congruence extension property if and only if it is a variety.
Subdirectly irreducible quasi-modal algebras.
Subdirectly irreducible sectionally pseudocomplemented semilattices
Sectionally pseudocomplemented semilattices are an extension of relatively pseudocomplemented semilattices—they are meet-semilattices with a greatest element such that every section, i.e., every principal filter, is a pseudocomplemented semilattice. In the paper, we give a simple equational characterization of sectionally pseudocomplemented semilattices and then investigate mainly their congruence kernels which leads to a characterization of subdirectly irreducible sectionally pseudocomplemented...
Subdirectly irreducible semilattices with an automorphism.
Subdirectly Irreducibles in some Varieties of Algebras having the Semilattice Structure