The Properties of Product of Relational Structures1
نویسنده
چکیده
(6) Let S, T be upper-bounded antisymmetric non empty relational structures and D be a subset of [:S, T :]. If [:S, T :] is complete or inf D exists in [:S, T :], then infD = 〈 infπ1(D), infπ2(D)〉. (7) Let S, T be non empty relational structures and x, y be elements of [:S, T :]. Then x ≤ {y} if and only if the following conditions are satisfied: (i) x1 ≤ {y1}, and (ii) x2 ≤ {y2}. 1This work has been supported by KBN Grant 8 T11C 018 12.
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