NOTATION
xv
Tm
denotes the representation of {S&)m associated with the representation
r o f «. (§5.1)
ML, MR, MJ denote the minimal conditions on the set of principal left,
right, two-sided ideals, respectively, of a semigroup. (A partially ordered
set P is said to satisfy the minimal condition if each non-empty subset A
of P contains at least one minimal element, i.e., an element x of A such
that yx(yeP) implies y$A.) (§§5.3, 5.4)
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