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sav07_lecture_2 [2007/03/22 20:35] vkuncak |
sav07_lecture_2 [2007/04/03 20:31] kremena.diatchka |
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| What is a formal proof? | What is a formal proof? | ||
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| \end{equation*} | \end{equation*} | ||
| - | Sets and properties are interchangable. | + | Sets and predicates are interchangable. |
| $x \in P$ turns set into predicate. | $x \in P$ turns set into predicate. | ||
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| <latex> | <latex> | ||
| \begin{array}{l} | \begin{array}{l} | ||
| - | \exists(x_2,y_2) \{((x_1,y_1)(x_2,y_2),(x_3,y_3)),y_2=y_1 \wedge x_2 = x_1 + 3\\ | + | \exists(x_2,y_2) \{((x_1,y_1)(x_2,y_2),(x_3,y_3)),y_2=y_1 \wedge x_2 = y_1 + 3\\ |
| \wedge y_3 = y_2 \wedge x_3 = x_2 + y_2 \} | \wedge y_3 = y_2 \wedge x_3 = x_2 + y_2 \} | ||
| \end{array} | \end{array} | ||
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| Weakest preconditions of assignments make wp very appealing. | Weakest preconditions of assignments make wp very appealing. | ||
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