Z User Workshop, York 1991
Broschiertes Buch

Z User Workshop, York 1991

Proceedings of the Sixth Annual Z User Meeting, York 16-17 December 1991

Herausgegeben: Nicholls, J. E.
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In ordinary mathematics, an equation can be written down which is syntactically correct, but for which no solution exists. For example, consider the equation x = x + 1 defined over the real numbers; there is no value of x which satisfies it. Similarly it is possible to specify objects using the formal specification language Z [3,4], which can not possibly exist. Such specifications are called inconsistent and can arise in a number of ways. Example 1 The following Z specification of a functionf, from integers to integers "f x : ~ 1 x ~ O· fx = x + 1 (i) "f x : ~ 1 x ~ O· fx = x + 2 (ii) is in...