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===Step 3 (Optional)===
 
===Step 3 (Optional)===
 +
 +
Check that <math>A \Rightarrow A</math> is a theorem of classical propositional calculus.
    
<pre>
 
<pre>
Check that A => A is a theorem of classical propositional calculus.
  −
   
   A  A
 
   A  A
 
   o---o      o---o
 
   o---o      o---o
 
   |          |
 
   |          |
 
   @    =    @    =    @
 
   @    =    @    =    @
 +
</pre>
    
Check.
 
Check.
</pre>
      
===Step 4===
 
===Step 4===
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