Sommaire

Contents
[On the conference “Binary systems and ring theoretic methods in universal algebra”]
Exponentiation without associativity
p. 3-7
Modules which are epi-equivalent to projective modules
p. 9-16
On semigroups admitting ring structure III
p. 17-22
Orthogonal permutation arrays and related structures
p. 23-38
Constructions of color schemes
p. 39-48
Feebly canonical and 1-hypergroups
p. 49-56
Exchangeable partial groupoids I
p. 57-72
One-element extensions of distributive groupoids
p. 73-77