Möbius function
(combinatorics) A function from the natural numbers to the set {−1, 0, 1} which maps perfect squares to 0, prime numbers to −1, and is multiplicative.
Former name of Jalandhar, a city in the north-western Indian state of Punjab.
Misspelling of necrotrophic.
plural of dropdown
自然数から集合{−1, 0, 1}への写像で、平方数を0に、素数を−1に写し、乗法的性質を持つ関数は、多くの組合せ論的な反転の議論で欠かせず、乗法的整数論で頻繁に現れます。
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