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- Jules Varlet
- Discrete Mathematics
- 1983

- Jules Varlet
- Discrete Mathematics
- 1985

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)

- Tom Blyth, Jules Varlet
- Discrete Mathematics
- 1990

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