An arithmetical set is a set of natural numbers which can be defined by a formula of first-order Peano arithmetic.
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an arithmetical multiplier for converting a quantity expressed in one set of units into an equivalent expressed in another.
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The main subgroup is the rational numbers. The set of irrational numbers is not closed with regard to addition basic arithmetical operations and so does not form a group.
It is an arithmetical statement.
ALU, the Arithmetic Logic Unit.