A = Q, (a*b) = a + b
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In the above expression, the identity element of the binary operation is zero.
From the identity's explanation e is the identity element if;
The binary operation in our case will be:
Letting e to be the binary element we get :
By subtracting a from both sides we get:
Therefore, the value of a can not be equal 1 because the binary operation * defined on Q-( 1 ).