Article
Keywords:
general closure operator; closure operator; modification of a closure operator; semigroup; left (right) partial x-operator in a semigroup; partial x-operator in a semigroup; x-extension (left, right) of a partial x-operator (left, right)
References:
[1] L. Skula:
On extensions of partial x-operators. Czechoslovak Mathematical Journal, 26 (191) 1976, Praha, (p. 477-505).
MR 0414765