Download Continuous Lattices and Domains by G. Gierz, K. H. Hofmann, K. Keimel, J. D. Lawson, M. PDF

By G. Gierz, K. H. Hofmann, K. Keimel, J. D. Lawson, M. Mislove, D. S. Scott

Info content material and programming semantics are only of the purposes of the mathematical techniques of order, continuity and domain names. This authoritative and complete account of the topic could be an important instruction manual for all these operating within the zone. an intensive index and bibliography make this an amazing sourcebook for all these operating in area concept.

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5. 4: (1) sup X exists; (2) sup ↓X exists. 4 O A Primer on Ordered Sets and Lattices And if these conditions are satisfied, then sup X = sup ↓X . Moreover, if every finite subset of X has a sup and if F denotes the set of all those finite sups, then F is directed, and (1) and (2) are equivalent to (3) sup F exists. Under these circumstances, sup X = sup F. If X is nonempty, we need not assume the empty sup belongs to F. Proof: Since, by transitivity and reflexivity, the sets X and ↓X have the same set of upper bounds, the equivalence of (1) and (2) and the equality of the sups are clear.

Thus, restricting f yields a monotone self-map on the complete lattice M. A dual argument to the above shows that the set F = {x ∈ M : f (x) ≤ x} also is a complete lattice. But F is exactly the set of all fixed-points of f as the elements of F are exactly those elements of L that satisfy both inequalities x ≤ f (x) and f (x) ≤ x. 3. We shall see many other examples of monotone maps. 10). 4. Let f : L → M be a map between complete lattices preserving sups. Then f (L) is closed under sups in M and is a complete lattice in itself.

5) If L is a Boolean algebra, we can construe it as an algebra of “propositions” (0 is false and 1 is true, ∧ and ∨ are conjunction and disjunction, complementation is negation). Filt L can be thought of as the lattice of theories. Any subset A ⊆ L can be taken as a set of “axioms” generating the following “theory”, Exercises 17 which is just a filter and corresponds to the propositions “implied” by the axioms: {x ∈ L : (∃a0 , . . , an−1 ∈ A) a0 ∧ · · · ∧ an−1 ≤ x}. The “inconsistent” theory is L, that is, the top filter generated by {0}.

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