unit function
(mathematics) a completely multiplicative function on the positive integers that is defined as equal to one for a special value and zero otherwise:
Alternative form of yokan
plural of purushartha
Alternative form of toll road
初等整数論では、正の整数上で n=1 のときは 1、その他のときは 0 となる完全乗法的関数が基本的な役割を果たします。
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