Weakly closed maximal triangular algebras are hyperreducible

Fuzzy weakly $e$-closed functions

In this paper, we introduce and characterize fuzzy wea-kly $e$-closed functions in fuzzy topological spaces and the relationship between these mappings and some properties of them are investigated.

On weakly e*-open and weakly e*-closed Functions

The aim of this paper is to introduce and study two new classes of functions called weakly $e^{*}$-open functions and weakly $e^{*}$-closed functions via the concept of $e^{*}$-open set defined by Ekici cite{erd1}. The notions of weakly $e^{*}$-open and weakly $e^{*}$-closed functions are weaker than the notions of weakly $beta$-open and weakly $beta$-closed functions defined by Caldas and Nava...

RS-BL-algebras are MV-algebras

We prove that RS-BL-algebras are MV-algebras.

Weakly maximal decidable structures

We prove that there exists a structure M whose monadic second order theory is decidable, and such that the elementary theory of every expansion of M by a constant is undecidable. 1991 Mathematics Subject Classification. 03B25, 03C57, 03D05.

Biflatness and Biprojectivitiy of Triangular Banach Algebras