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We continue from [11] the study of linear algebraic semigroups. Let S be a connected
algebraic semigroup defined over an algebraically closed field K. Let $\mathcal {U}(S) $ be …

Mathematica Bohemica Page 1 Mathematica Bohemica Bohdan Zelinka Subtraction
semigroups Mathematica Bohemica, Vol. 120 (1995), No. 4, 445–447 Persistent URL: http://dml.cz/dmlcz/126093 …

§ 0. Introduction. Given a semi-group 8 of continuous linear transformations of Elinto itself
and an element ar of E, one can ask (a) whether the closed convex hull of the orbit of a …

A regular semigroup S is called fundamental if the identity congruence is the only
congruence on S contained in H. Structure theorems for certain important subclasses of the …

Let $ X $ be a Banach space. We denote by $ B (X) $ the set of all bounded linear operators
from $ X $ into itself. Let $ C $ be an iniective operator in $ B (X) $. We do not assume that …

This paper is a contribution to the theory of weakly sequentially complete Banach algebrasA.
We require them to have bounded approximate identities and, for the most part, to be ideals …

In 1971, SG Krein, GI Laptev and GA Cvetkova [KLC] proved that any linear (unbounded)
operator A on a Banach space E such that the resolvent set contains a half-line (w, cx~) …

By a completely regular (“cr “) semigroup we mean a semigroup which is a union of groups.
For an account of these, see [1, Sect. 4.21 or [9, Chap. IV]. DB McAlister[S, Sect. 31 showed …

Idempotent Semigroups Page 1 110 MATHEMATICAL NOTES [February IDEMPOTENT
SEMIGROUPS DAVID MCLEAN, University of Chicago An idempotent semigroup is a system …