Given that
* Step 1: Let a=b.
* Step 2: Then a^2 = ab,
* Step 3: a^2 + a^2 = a^2 + ab,
* Step 4: 2 a^2 = a^2 + ab,
* Step 5: 2 a^2 - 2 ab = a^2 + ab - 2 ab,
* Step 6: and 2 a^2 - 2 ab = a^2 - ab.
* Step 7: This can be written as 2 (a^2 - a b) = 1 (a^2 - a b),
* Step 8: and cancelling the (a^2 - ab) from both sides gives 1=2.