Proof: Do Line At Unchanged 59

Let's prove the following theorem:

if the following are true:
  • expression state at time 59 = "return"
  • the line at time 59 = 6

then the line at time 60 = 6

Proof:

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Given
1 expression state at time 59 = "return"
2 the line at time 59 = 6
Proof Table
# Claim Reason
1 the line at time (59 + 1) = the line at time 59 if expression state at time 59 = "return", then the line at time (59 + 1) = the line at time 59
2 the line at time (59 + 1) = 6 if the line at time (59 + 1) = the line at time 59 and the line at time 59 = 6, then the line at time (59 + 1) = 6
3 59 + 1 = 60 59 + 1 = 60
4 the line at time (59 + 1) = the line at time 60 if 59 + 1 = 60, then the line at time (59 + 1) = the line at time 60
5 the line at time 60 = 6 if the line at time (59 + 1) = the line at time 60 and the line at time (59 + 1) = 6, then the line at time 60 = 6

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