In mathematics, a numerical semigroup is a special kind of a semigroup. Its underlying set is the set of all nonnegative integers except a finite number of integers, and the binary operation is the operation of addition of integers.
In mathematics, a numerical semigroup is a special kind of a semigroup. Its underlying set is the set of all nonnegative integers except a finite number of integers, and the binary operation is the operation of addition of integers.
Source: Wikipedia "Numerical semigroup" · CC BY-SA 4.0
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