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The Computer Journal 1977 20(2):151-155; doi:10.1093/comjnl/20.2.151
© 1977 by British Computer Society
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Generic commands—a tool for partial correctness formalisms

J. Schwarz *

Department of Artificial Intelligence, University of Edinburgh, Hope Park Square, Meadow Lane, Edinburgh, UK

A semantic framework for logical formalisms based on partial correctness assertions of the form P{S}Q is given. P{S}Q asserts that if P holds before execution of S then Q holds after. Generic commands are introduced. The generic command {P=≥Q} is in a sense the least specified command with precondition P and postcondition Q. Proof rules and a noneffective semantics are given for generic commands. A proof rule for recursive procedures is given using generic commands.

Received October 1975.

* Department of Artificial Intelligence, University of Edinburgh, Hope Park Square, Meadow Lane, Edinburgh EH8 9NW


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