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自然数の分割
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Wikipedia definition
1. Partition (number theory)​In number theory and combinatorics, a partition of a positive integer n, also called an integer partition, is a way of writing n as a sum of positive integers. Two sums that differ only in the order of their summands are considered to be the same partition; if order matters then the sum becomes a composition. For example, 4 can be partitioned in five distinct ways: 4,     3 + 1,     2 + 2,     2 + 1 + 1,     1 + 1 + 1 + 1.
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