Proof: Write Skip Line State 3

Let's prove the following theorem:

if the following are true:
  • the line at time 3 = 4
  • the tab at time 3 = 1
  • statement at line 4, tab 2 = self.y = 0

then expression state at time 4 = "not_expr"

Proof:

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

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