Proof: Remove One 2
Let's prove the following theorem:
if not (a = 0), then (1 / a) ⋅ (a ⋅ x) = x
    
    
    
    Proof:
  
      
      Given
      
    
    
      
  
  
| 1 | not (a = 0) | 
|---|
| # | Claim | Reason | 
|---|---|---|
| 1 | ((1 / a) ⋅ a) ⋅ x = x | if not (a = 0), then ((1 / a) ⋅ a) ⋅ x = x | 
| 2 | ((1 / a) ⋅ a) ⋅ x = (1 / a) ⋅ (a ⋅ x) | ((1 / a) ⋅ a) ⋅ x = (1 / a) ⋅ (a ⋅ x) | 
| 3 | (1 / a) ⋅ (a ⋅ x) = x | if ((1 / a) ⋅ a) ⋅ x = x and ((1 / a) ⋅ a) ⋅ x = (1 / a) ⋅ (a ⋅ x), then (1 / a) ⋅ (a ⋅ x) = x | 
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