Proof: Write Skip Line State 23

Let's prove the following theorem:

if the following are true:
  • the line at time 23 = 4
  • the tab at time 23 = 0
  • statement at line 4, tab 1 = a = 8

then expression state at time 24 = "not_expr"

Proof:

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Given
1 the line at time 23 = 4
2 the tab at time 23 = 0
3 statement at line 4, tab 1 = a = 8
Proof Table
# Claim Reason
1 1 > 0 1 > 0
2 expression state at time (23 + 1) = "not_expr" if the line at time 23 = 4 and the tab at time 23 = 0 and statement at line 4, tab 1 = a = 8 and 1 > 0, then expression state at time (23 + 1) = "not_expr"
3 23 + 1 = 24 23 + 1 = 24
4 expression state at time (23 + 1) = expression state at time 24 if 23 + 1 = 24, then expression state at time (23 + 1) = expression state at time 24
5 expression state at time 24 = "not_expr" if expression state at time (23 + 1) = expression state at time 24 and expression state at time (23 + 1) = "not_expr", then expression state at time 24 = "not_expr"

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