The existence and structure of IRR(X).
The existence of Irr X.
Semigroups over trees.
A class of semigroups having almost trivial multiplications.
Semilattices which must contain a copy of 2 N.
The centralizing theorem for left normal groups of units in compact monoids.
Dimension raising maps in topological spaces.
Errors in elements of compact semigroups.
Dimension Raising Maps in Topological Algebra.
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