Blecher–Knopfmacher's fixed-point inequality for integer partitions

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Let nn be a positive integer, and let p(n)p(n) denote the number of partitions of nn. A partition λ=(λ1,…,λj)\lambda=(\lambda_1,\ldots,\lambda_j) of nn, written λ⊢n\lambda\vdash n, has a fixed point if λi=i\lambda_i=i for some index ii. Let f(n)f(n) be the number of partitions of nn with a fixed point and g(n)g(n) the number without a fixed point. Blecher–Knopfmacher's conjecture. For all n>2n>2, there are more partitions of nn without a fixed point than partitions of nn with a fixed point; equivalently,

g(n)>f(n).g(n)>f(n).

The paper resolves this open question by proving the inequality and relating fixed points to Frobenius symbols, Dyson's crank, the mex, and other partition statistics.

References

Primary source

Brian Hopkins and James A. Sellers, “On Blecher and Knopfmacher's Fixed Points for Integer Partitions”, arXiv:2305.05096 (2023).

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