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The rank of a partition, shown as its Young diagram Freeman Dyson in 2005. In number theory and combinatorics, the rank of an integer partition is a certain number associated with the partition. In fact at least two different definitions of rank appear in the literature.
The rank of a partition is the integer obtained by subtracting the number of parts in the partition from the largest part in the partition. For example, the rank of the partition λ = { 4, 2, 1, 1, 1 } of 9 is 4 − 5 = −1. Denoting by N(m, q, n), the number of partitions of n whose ranks are congruent to m modulo q, Dyson considered N(m, 5 ...
The rank of a partition is the largest number k such that the partition contains at least k parts of size at least k. For example, the partition 4 + 3 + 3 + 2 + 1 + 1 has rank 3 because it contains 3 parts that are ≥ 3, but does not contain 4 parts that are ≥ 4.
An equivalent, but more visual, definition is that the Durfee square is the largest square that is contained within a partition's Ferrers diagram. [2] The side-length of the Durfee square is known as the rank of the partition. [3] The Durfee symbol consists of the two partitions represented by the points to the right or below the Durfee square.
Partition function (number theory) Pentagonal number theorem; Plane partition; R. Rank of a partition; Representation theory of the symmetric group; Rogers ...
The RANK() OVER window function acts like ROW_NUMBER, but may return more or less than n rows in case of tie conditions, e.g. to return the top-10 youngest persons: SELECT * FROM ( SELECT RANK () OVER ( ORDER BY age ASC ) AS ranking , person_id , person_name , age FROM person ) AS foo WHERE ranking <= 10
The poset Y is graded: the minimal element is ∅, the unique partition of zero, and the partitions of n have rank n. This means that given two partitions that are comparable in the lattice, their ranks are ordered in the same sense as the partitions, and there is at least one intermediate partition of each intermediate rank. The poset Y is a ...
Generally, a partition is a division of a whole into non-overlapping parts. Among the kinds of partitions considered in mathematics are partition of a set or an ordered partition of a set, partition of a graph, partition of an integer, partition of an interval, partition of unity, partition of a matrix; see block matrix, and