Note on the Chebyshev polynomials and applications to the Fibonacci numbers.
Note on complemented closure operators of complete lattices
Corrections to the article "Unitary analogue of the Nagell totient function" (Port. Math., 21(4) (1962), 221-232)
Note on quasi-orders, partial orders and orders
On complete congruences of complete lattices
On the closure operators of the ordinal product of partially ordered sets
Some remarks on quasi-isomorphisms between finite lattices
Lattices in which implies or
Some remarks on two generalizations of Euler's theorem
A property of the Euler -function concerning the integers which are regular modulo n
Note on the system of closure operators of the ordinal product of partially ordered sets
Another generalization of Euler's theorem
Some remarks on an identity of Catalan concerning the Fibonacci numbers
Some results on closure operators of partially ordered sets
Quasi-isomorphisms between complete lattices
Unitary analogue of a Schemmel's function
Some remarks on the unitary analogue of the Nagell totient function
A note on the endomorphisms associated to semi-direct decompositions of a group
Factorization of the lattice of closure operators of a complete lattice
Note on -complete congruences of -complete lattices
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