Dr. F. H. S. Curd

Dr H. S. Davidson

interests of this ancient Society; we recall the occasions on which, by means of papers and discussion, he contributed so profitably to our deliberations out of his large experience; but we remember, perhaps, more even than these, the appeal of a personality that charmed us alike by its simplicity, its sympathy and its sincerity. The loss the Society has sustained in the death of Davidson is a ...

Dr. W. H. S. Walker

Dr. Houria Hadj F

Great ! How ’ s the simulation ? H a n d o f f How ’ s life ? Hectic !

Partially Ordered Monoids Generated by Operators H , S , P , and by H , S , P f Are

Let I , H , S , P , Pf be the usual operators on classes of algebras of the same type (Pf for filtered products). The partially ordered monoid generated by the operators H , S , P with respect to composition of operators, I as an identity element, and a natural ordering between operators is described by Pigozzi (Algebra Universalis 2 (1972), 346–353). Let us denote by M = 〈H,S, P 〉 and by Mf = ...