摘要: 2. There exist two hopjian lattices such that their free product isnot hopjian.In Theorem 2 (coproduct, sum) has its usual meaning (see, forinstance, [4]);in 1 we use the definition butall are assumedto be bounded (that is, having a least element 0 and largest 1) allhomomorphisms assumed to {O,l}-homomorphisms homomorphisms preserving 1).Recall, lattice L (group, ring, so on) is called ifL notisomorphic any properquotient
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