Proof: Byte 127 Stays the Same 5
Let's prove the following theorem:
if the following are true:
- instruction #11 is
addi dst=3 src=0 imm=3
- the PC at time 5 = 11
- value of cell 127 at time 5 = 2
then value of cell 127 at time 6 = 2
Proof:
Given
1 | instruction #11 is addi dst=3 src=0 imm=3 |
---|---|
2 | the PC at time 5 = 11 |
3 | value of cell 127 at time 5 = 2 |
# | Claim | Reason |
---|---|---|
1 | not (127 = 3) | not (127 = 3) |
2 | value of cell 127 at time (5 + 1) = value of cell 127 at time 5 | if instruction #11 is addi dst=3 src=0 imm=3 and the PC at time 5 = 11 and not (127 = 3), then value of cell 127 at time (5 + 1) = value of cell 127 at time 5 |
3 | 5 + 1 = 6 | 5 + 1 = 6 |
4 | value of cell 127 at time (5 + 1) = value of cell 127 at time 6 | if 5 + 1 = 6, then value of cell 127 at time (5 + 1) = value of cell 127 at time 6 |
5 | value of cell 127 at time 6 = value of cell 127 at time 5 | if value of cell 127 at time (5 + 1) = value of cell 127 at time 6 and value of cell 127 at time (5 + 1) = value of cell 127 at time 5, then value of cell 127 at time 6 = value of cell 127 at time 5 |
6 | value of cell 127 at time 6 = 2 | if value of cell 127 at time 6 = value of cell 127 at time 5 and value of cell 127 at time 5 = 2, then value of cell 127 at time 6 = 2 |
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