if the following are true:

• the line at time 58 = 3
• the tab at time 58 = 0
• statement at line 3, tab 1 = a = __add__(a, 1)
• Variables Map at time 58 = [ entry a: 2, [ ] ]

then Variables Map at time 59 = [ entry a: 2, [ ] ]

Start from the conclusion and work back up the proof. Click the arrow to show the parents.