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Disjoint and complete unions of incidence structures

František Machala, Marek Pomp (1997)

Mathematica Bohemica

Some decompositions of general incidence structures with regard to distinguished components (modular or simple) are considered and several structure theorems for them are deduced.

Distributive differential modals

Karolina Ślusarska (2008)

Discussiones Mathematicae - General Algebra and Applications

A differential modal is an algebra with two binary operations such that one of the reducts is a differential groupoid and the other is a semilattice, and with the groupoid operation distributing over the semilattice operation. The aim of this paper is to show that the varieties of entropic and distributive differential modals coincide, and to describe the lattice of varieties of entropic differential modals.

Distributivity of lattices of binary relations

Ivan Chajda (2002)

Mathematica Bohemica

We present a formal scheme which whenever satisfied by relations of a given relational lattice L containing only reflexive and transitive relations ensures distributivity of L .

Double n -ary relational structures

Jiří Karásek (1997)

Mathematica Bohemica

In [7], V. Novak and M. Novotny studied ternary relational structures by means of pairs of binary structures; they obtained the so-called double binary structures. In this paper, the idea is generalized to relational structures of any finite arity.

Currently displaying 41 – 60 of 65