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English
[en]
Also a ∗ b = a + b − ab = b + a − ba = b ∗ a Hence (Q, ∗) is a commutative semigroup.
Spanish
[es]
También, a ∗ b = a + b − ab = b + a − ba = b ∗ a c) Así, (Q, ∗) es un semigrupo conmutativo.
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