Floyd method

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A method for proving the partial correctness of a program (see program correctness proof). Certain points in the program are designated as cut-points, and to each cut-point is attached an inductive assertion. The inductive assertions are chosen so that, whenever a cut-point is reached, the program is in a “correct state”, i.e. one that satisfies the inductive assertion attached to that point. To establish this, it is necessary to consider each “minimal path”, i.e. each path leading from a cut-point directly to a cut-point, and to show that, provided the program is already in a correct state, it will still be in one after following that path.

Subjects: Computing.

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