V2EX conjugate partition

Conjugate Partition

定义 Definition

在整数分拆(partition)理论中,conjugate partition(共轭分拆)指把一个分拆的杨图/费雷图(Young/Ferrers diagram)沿主对角线转置后得到的分拆。等价地说:原分拆中“每一行的长度”与共轭分拆中“每一列的高度”互相对应。

发音 Pronunciation (IPA)

/kndt ptn/

例句 Examples

A conjugate partition is found by swapping rows and columns in the diagram.
共轭分拆可以通过在图中交换行与列来得到。

If \(\lambda=(5,3,1)\), then its conjugate partition \(\lambda'\) records how many parts of \(\lambda\) are at least \(1,2,3,\dots\), which is the same as transposing the Young diagram.
如果 \(\lambda=(5,3,1)\),那么它的共轭分拆 \(\lambda'\)会记录\(\lambda\)中有多少个部分至少为\(1,2,3,\dots\),这与把杨图转置是同一件事。

词源 Etymology

Conjugate源自拉丁语 conjugare(“结合、成对”),在数学里常表示“对应的/成对的变换”。Parition来自拉丁语 partitio(“分割、分配”)。合起来在组合数学语境中表示:与原分拆通过“转置(transpose)”成对对应的那个分拆。

相关词 Related Words

文学/经典著作中的用例 Literary Works

  • Enumerative Combinatorics, Volume 1 Richard P. Stanley(讨论分拆、杨图与共轭分拆)
  • The Theory of Partitions George E. Andrews(分拆理论经典著作,涉及共轭分拆性质)
  • Symmetric Functions and Hall Polynomials I. G. Macdonald(在对称函数与表示论背景下使用共轭分拆/转置分拆)
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