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sav07_lecture_4_skeleton [2007/03/22 20:45] vkuncak |
sav07_lecture_4_skeleton [2007/03/22 23:12] olivier.gobet |
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| We use weakest preconditions, although you could also use strongest postconditions or any other variants of the conversion from programs to formulas. | We use weakest preconditions, although you could also use strongest postconditions or any other variants of the conversion from programs to formulas. | ||
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| ===== More on wp ===== | ===== More on wp ===== | ||
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| === wp of havoc === | === wp of havoc === | ||
| - | Can we derive wp(Q,havoc(x)? | + | Can we derive wp(Q,havoc(x))? |
| * By consider havoc(x) as (... [] x=-1 [] x = 0 [] x = 1 [] ...) ? | * By consider havoc(x) as (... [] x=-1 [] x = 0 [] x = 1 [] ...) ? | ||
| * From relational definition? | * From relational definition? | ||
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| * [[Gallier Logic Book]], Chapter 10.6 | * [[Gallier Logic Book]], Chapter 10.6 | ||
| * {{nelsonoppen80decisionprocedurescongruenceclosure.pdf|the original paper by Nelson and Oppen}} | * {{nelsonoppen80decisionprocedurescongruenceclosure.pdf|the original paper by Nelson and Oppen}} | ||
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