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O A SCIENCE OF COMPUTING
THE PROPOSITIONAL CALCULUS
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algorithm argument array aſi aſil aſk assignment assignment axiom Assume begin bound called cards casket chapter color(i compute conclusion condition consequence consider Construct containing correctness deck defined definition denote describes determine discussed disk distributivity elements empty equal equivalent example executed Exercises expression false final formal function given gold guarantee heap Hence implication induction initial integer invariant involve length logical loop meaning middle move n+(n node Note obtain occurrences operators path points polynomial positive possible postcondition precondition predicate premise present problem proof proposition prove quantifier range remainder rule satisfying segment sequential composition Show shown simple simplifies solution specification split square statement step Suppose termination true truth table valid variables Variant verification wb(S wo(S