Proof: Do Stack At Unchanged 55
Let's prove the following theorem:
if the following are true:
- expression state at time 55 = "iterate_args"
- stack at time 55 = [ ]
then stack at time 56 = [ ]
Proof:
Given
1 | expression state at time 55 = "iterate_args" |
---|---|
2 | stack at time 55 = [ ] |
# | Claim | Reason |
---|---|---|
1 | stack at time (55 + 1) = stack at time 55 | if expression state at time 55 = "iterate_args", then stack at time (55 + 1) = stack at time 55 |
2 | stack at time (55 + 1) = [ ] | if stack at time (55 + 1) = stack at time 55 and stack at time 55 = [ ], then stack at time (55 + 1) = [ ] |
3 | 55 + 1 = 56 | 55 + 1 = 56 |
4 | stack at time (55 + 1) = stack at time 56 | if 55 + 1 = 56, then stack at time (55 + 1) = stack at time 56 |
5 | stack at time 56 = [ ] | if stack at time (55 + 1) = stack at time 56 and stack at time (55 + 1) = [ ], then stack at time 56 = [ ] |
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