Geodesic

Volume 12 (1973) no. 4

Sommaire

Theory of $A$-spaces
p. 369-416
Prevarieties of semigroups whose elementary theory is decidable
p. 417-432
btt-reducibility.~II
p. 433-444
Sturctures with implication
p. 445-467
Automorphisms of two-dimensional congruence groups
p. 468-477
Solvability of $(-1,1)$-nilrings
p. 478-489