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Results tagged with hoare-logic
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user 57867
Questions about Hoare's logical framework for program correctness proofs and variants.
2
votes
2
answers
77
views
How to change the algorithm implication by changing the invariant?
I have this specification in GCL:
$[Ctx C: n\geqslant 0\ \wedge\ b:[0..n-1]\ \text{of int}$
$\{Q:\text{True}\}$
$sum,i:=0,0;$
$\{\text{Invariant}\ P: 0\leqslant i \leqslant n\ \wedge sum=\sum_{j=0 …
- 183
5
votes
1
answer
2k
views
What is a predicate transformer?
I'm reading Programming - The derivation of algorithms, and I want to understand the purpose of a predicate transformer. This is the excerpt (p. 14-15):
A more precise way in which constructs may be …
- 183
1
vote
0
answers
23
views
How to define the dimension function for searching in a 3D-array?
Problem:
Propose a plan (pre- and post-condition, invariant, dimension function) for searching a value in a 3D-array.
Solution:
This is the first solution I've foreseen:
$[\text{Ctx}\ C: m\geqslan …
- 183