A = Q, (a*b) = a + b
"A=Q\\left(a\\cdot b\\right)=a+b"
In the above expression, the identity element of the binary operation is zero.
From the identity's explanation e is the identity element if; "a\\cdot e=a=e\\cdot a"
The binary operation in our case will be: "a\\cdot b=a+b-ab"
Letting e to be the binary element we get :
"a\\cdot e=a\\:\\:"
"a+e-ae=a"
By subtracting a from both sides we get:
"e-ae=0\\:"
"e\\left(1-a\\right)=0"
"a=1\\:and\\:e=0"
Therefore, the value of a can not be equal 1 because the binary operation * defined on Q-( 1 ).
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