Proof: Do Stack At Unchanged 13

Let's prove the following theorem:

if the following are true:
  • expression state at time 13 = "iterate_args"
  • stack at time 13 = [ ]

then stack at time 14 = [ ]

Proof:

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Given
1 expression state at time 13 = "iterate_args"
2 stack at time 13 = [ ]
Proof Table
# Claim Reason
1 stack at time (13 + 1) = stack at time 13 if expression state at time 13 = "iterate_args", then stack at time (13 + 1) = stack at time 13
2 stack at time (13 + 1) = [ ] if stack at time (13 + 1) = stack at time 13 and stack at time 13 = [ ], then stack at time (13 + 1) = [ ]
3 13 + 1 = 14 13 + 1 = 14
4 stack at time (13 + 1) = stack at time 14 if 13 + 1 = 14, then stack at time (13 + 1) = stack at time 14
5 stack at time 14 = [ ] if stack at time (13 + 1) = stack at time 14 and stack at time (13 + 1) = [ ], then stack at time 14 = [ ]

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