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Lattice theory - Stanford University
boole.stanford.eduChapter 1 Lattice theory 1.1 Partial orders 1.1.1 Binary Relations A binary relation Ron a set Xis a set of pairs of elements of X. That is, R⊆ X2. We write xRyas a synonym for (x,y) ∈ Rand say that Rholds at (x,y). We may also view Ras a square matrix of 0’s and 1’s, with rows and columns each indexed by elements of X. Then R xy = 1 ...