Sommaire

Contents
On decomposition of projections of finite order
p. 3-8
On midpoints in lattices
p. 9-15
Groupoids and the associative law III. (Szász-Hájek groupoids)
p. 17-30
Groupoids and the associative law V. (Szász-Hájek groupoids fo type (A, A, B))
p. 31-44