A universal form of relational systems. (English. Russian original) Zbl 0667.08002
Vestn. Leningr. Univ., Math. 21, No. 3, 50-55 (1988); translation from Vestn. Leningr. Univ., Ser. I 1988, No. 3, 39-44 (1988).
See the review in Zbl 0656.08001.
MSC:
08A02 | Relational systems, laws of composition |