Differences
This shows you the differences between two versions of the page.
| Both sides previous revision Previous revision | Next revision Both sides next revision | ||
|
sav07_lecture_3_skeleton [2007/03/21 10:58] vkuncak |
sav07_lecture_3_skeleton [2007/03/21 10:59] vkuncak |
||
|---|---|---|---|
| Line 102: | Line 102: | ||
| This idea is important in static analysis. | This idea is important in static analysis. | ||
| + | |||
| Line 127: | Line 128: | ||
| Like composition of a set with a relation. It's called ''relational image'' of set $P$ under relation $r$. | Like composition of a set with a relation. It's called ''relational image'' of set $P$ under relation $r$. | ||
| - | Note: when proving our verification condition, instead of proving that semantics of relation implies error=false, it's same as proving that the formula for set sp(U,r) implies error=false, where U is the universal relation. | + | Note: when proving our verification condition, instead of proving that semantics of relation implies error=false, it's same as proving that the formula for set sp(U,r) implies error=false, where U is the universal relation, or, in terms of formulas, computing the strongest postcondition of formula 'true'. |
| ==== Weakest preconditions ==== | ==== Weakest preconditions ==== | ||