Fixed points in finite de Morgan algebras


We eharacterise the fixed points of the polarity of a de Morgan algebra by means of binary partitions of the subset of join-irreducible elements. We apply this characterisation to compute the number of fixed" points in the finite distributive lattices every interval of which can be made into a de Morgan algebra and in the free distributive lattices FD(n… (More)
DOI: 10.1016/0012-365X(85)90147-5


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