P.S.Gevorgyan

Faculty of Mathematics

Moscow State Pedagogical University

Krasnoprudnaya str., 14, Moscow, Russia

E-mail:

I.Pop

Faculty of Mathematics

”Al.I.Cuza” University

700505-Iasi, Romania

E-mail:

Faculty of Mathematics

Moscow State Pedagogical University

Krasnoprudnaya str., 14, Moscow, Russia

E-mail:

I.Pop

Faculty of Mathematics

”Al.I.Cuza” University

700505-Iasi, Romania

E-mail:

**Shape dimension of maps**- Semi-integral filters and semi-integral
**BL**-algebras - Orthogonality and retract orthogonality of operations
- An Approach for Determining the Optimal Strategies for an Average Markov Decision Problem with Finite State and Action Spaces
- The Center of the Lattice of Factorization Structures
- Properties of finite unrefinable chains of ring topologies for nilpotent rings
- Quartic differential systems with an invariant straight line of maximal multiplicity
- Distances on Free Semigroups and Their Applications
- Integrability conditions for a class of cubic differential systems with a bundle of two invariant straight lines and one invariant cubic