ЗМІСТ

Nicolai N. Semko (dedicated to 60-th Birthday)

Kirichenko V.V., Kurdachenko L.A., Pypka A.A., Subbotin I.Ya.
Some aspects of Leibniz algebra theory

Semko N.N., Velychko T.V.
On groups whose subgroups of infinite special rank are transitively normal

Mamede Albuquerque H.M., Félix Barreiro M.E., Sánchez Delgado J.M.
(Gϕ) -crossed product on (Gϕ)-quasiassociative algebras

Atapour M., Norouzian S., Sheikholeslami S.M., Volkmann L.
Twin signed domination numbers in directed graphs

Bhattacharyya R.
Flat extension and phantom homology

Chapovsky E., Shevchyk O.
On divergence and sums of derivations

Diaz R.
Quantum Boolean algebras

Drozd Yu.A., Plakosh A.I.
Cohomologies of finite abelian groups

Mihoubi M., Belbachir H.
Identities related to integer partitions and complete Bell polynomials

Pratsiovytyi M., Karvatsky D.
Jacobsthal-Lucas series and their applications