зеркало из https://github.com/microsoft/ivy.git
23 строки
202 B
Plaintext
23 строки
202 B
Plaintext
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#lang ivy1.7
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type t
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relation p(X:t)
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#axiom X:t = 0 & Y = 0 -> X = Y
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#axiom X:t = Y & Y = 0 -> X = 0
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invariant p(X)
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after init {
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p(X) := true
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}
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action a(x:t) = {
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p(x) := false
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}
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export a
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