Sommaire

Contents
Quasitrivial semimodules. III.
p. 3-13
On separating sets of words. II.
p. 15-28
Various subsemirings of the field $\Bbb Q$ of rational numbers
p. 29-59
Various examples of parasemifields
p. 61-72
Groupoids and the associative law IIIA. (Primitive extensions of SH-groupoids and their semigroup distances)
p. 73-82