# The Spine of Software: Designing Provably Correct Software: by Robert Laurence Baber By Robert Laurence Baber

Robert Baber's unique method of the semantics of machine courses will familiarize software program designers and builders with appropriate result of learn within the concept of proving courses right. through the booklet, the mathematical therapy is rigorous. A physique of primary ideas underlying computing technology has been built lately: those offer instructions for the layout approach, and permit the software program engineer to make sure systematically and accurately vital features of proposed designs. The software program engineer is therefore able to boost error-free courses simply as engineers in different fields may be able to confirm their designs.

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Fully parenthesized proposition: any proposition that can be obtained using the following recursive deﬁnition: each variable is fully parenthesized, if P and Q are fully parenthesized, so are (¬P ), (P ∧ Q), (P ∨ Q), (P → Q), and (P ↔ Q). function f : A → B: a rule that assigns to every object a in the domain set A exactly one object f (a) in the codomain set B. functionally complete set: a set of logical connectives from which all other connectives can be derived by composition. c 2000 by CRC Press LLC fuzzy logic: a system of logic in which each statement has a truth value in the interval [0, 1].

Aim ) ∈ Ai1 × Ai2 × · · · × Aim , there is at most one n-tuple in R that matches (ai1 , ai2 , . . , aim ) in coordinates i1 , i2 , . . , im . composition (of relations): for R a relation from A to B and S a relation from B to C, the relation S ◦ R from A to C such that a(S ◦ R)c if and only if there exists b ∈ B such that aRb and bSc. composition (of functions): the function f ◦ g whose value at x is f (g(x)). compound proposition: a proposition built up from atomic propositions and logical connectives.

Ramanujan left behind several notebooks containing statements of thousands of results, enough work to keep many mathematicians occupied for years in understanding and proving them. Frank Ramsey (1903–1930), son of the president of Magdalene College, Cambridge, was educated at Winchester and Trinity Colleges. He was then elected a fellow of King’s College, where he spent the remainder of his life. Ramsey made important contributions to mathematical logic. What is now called Ramsey theory began with his clever combinatorial arguments to prove a generalization of the pigeonhole principle, published in the paper “On a Problem of Formal Logic”.