Proof: Do Control Map At Unchanged 18
Let's prove the following theorem:
if the following are true:
- expression state at time 18 = "begin_expr"
- Control Map at time 18 = [ entry 0: (pair ("while", 2)), [ ] ]
then Control Map at time 19 = [ entry 0: (pair ("while", 2)), [ ] ]
Proof:
Given
1 | expression state at time 18 = "begin_expr" |
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2 | Control Map at time 18 = [ entry 0: (pair ("while", 2)), [ ] ] |
# | Claim | Reason |
---|---|---|
1 | Control Map at time (18 + 1) = Control Map at time 18 | if expression state at time 18 = "begin_expr", then Control Map at time (18 + 1) = Control Map at time 18 |
2 | Control Map at time (18 + 1) = [ entry 0: (pair ("while", 2)), [ ] ] | if Control Map at time (18 + 1) = Control Map at time 18 and Control Map at time 18 = [ entry 0: (pair ("while", 2)), [ ] ], then Control Map at time (18 + 1) = [ entry 0: (pair ("while", 2)), [ ] ] |
3 | 18 + 1 = 19 | 18 + 1 = 19 |
4 | Control Map at time (18 + 1) = Control Map at time 19 | if 18 + 1 = 19, then Control Map at time (18 + 1) = Control Map at time 19 |
5 | Control Map at time 19 = [ entry 0: (pair ("while", 2)), [ ] ] | if Control Map at time (18 + 1) = Control Map at time 19 and Control Map at time (18 + 1) = [ entry 0: (pair ("while", 2)), [ ] ], then Control Map at time 19 = [ entry 0: (pair ("while", 2)), [ ] ] |
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