3. CARRYING OUT THE PLAN

  1. UNDERSTANDING THE PROBLEM
  2. DEVISING A PLAN
  3. ✓ CARRYING OUT THE PLAN
  4. LOOKING BACK

Third. Carry out your plan…. Carrying out your plan of the solution, check each step. Can you see clearly that the step is correct? Can you prove that it is correct?

-- G.Polya "HOW TO SOLVE IT", Kindle Edition, 2014

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