Borozenets' rank–crank inequalities modulo 11

From papers

Let M(m,n)M(m,n) and N(m,n)N(m,n) denote, respectively, the numbers of partitions of nn with crank and rank mm. Let M(a,c;n)M(a,c;n) and N(a,c;n)N(a,c;n) denote, respectively, the numbers of partitions of nn with crank and rank congruent to a (modc)a\ \, \left( \mathrm{mod} \, c \right). For sequences a={a(n)}n=1a=\{a(n)\}_{n=1}^{\infty} and b={b(n)}n=1b=\{b(n)\}_{n=1}^{\infty}, write aNba\le_N b when a(n)b(n)a(n)\le b(n) for nNn\ge N, and write aba\le b when a(n)b(n)a(n)\le b(n) for n0n\ge0. For 0j,d<110\le j,d<11, define

Nj,d(n):=N(j,11;11n+d),Mj,d(n):=M(j,11;11n+d),pd(n):=p(11n+d).N_{j,d}(n):=N(j,11;11n+d),\qquad M_{j,d}(n):=M(j,11;11n+d),\qquad p_d(n):=p(11n+d).

Borozenets' conjecture. The following chains of inequalities hold:

N5,0N4,02N3,0M1,0p011M0,01N2,0N1,03N0,0,N5,1N4,1N3,11M0,1M2,1p111M1,11N2,1N1,1N0,1,N5,2N4,2N3,2M0,2p211M2,21N2,2N1,23N0,2,N5,3N4,3N3,3M1,3p311M0,3N2,31N1,32N0,3,N5,43N4,4N3,41M1,4p411M0,41N2,4N1,43N0,4,N5,5N4,51N3,5M2,5p511M0,5N2,5N1,5N0,5,N5,61N4,6N3,6p611N2,6N1,61N0,6,N5,7N4,7N3,7M0,7p711M1,7N2,71N1,7N0,7,N5,8N4,8N3,8M0,83p8113M1,8N2,8N1,83N0,8,N5,9N4,9N3,91M0,9p911M1,9N2,9N1,92N0,9,N5,10N4,10N3,101M3,10p1011M0,10N2,10N1,103N0,10.\begin{aligned} N_{5,0}&\le N_{4,0}\le_2 N_{3,0}\le M_{1,0}\le \frac{p_0}{11}\le M_{0,0}\le_1 N_{2,0}\le N_{1,0}\le_3 N_{0,0},\\ N_{5,1}&\le N_{4,1}\le N_{3,1}\le_1 M_{0,1}\le M_{2,1}\le \frac{p_1}{11}\le M_{1,1}\le_1 N_{2,1}\le N_{1,1}\le N_{0,1},\\ N_{5,2}&\le N_{4,2}\le N_{3,2}\le M_{0,2}\le \frac{p_2}{11}\le M_{2,2}\le_1 N_{2,2}\le N_{1,2}\le_3 N_{0,2},\\ N_{5,3}&\le N_{4,3}\le N_{3,3}\le M_{1,3}\le \frac{p_3}{11}\le M_{0,3}\le N_{2,3}\le_1 N_{1,3}\le_2 N_{0,3},\\ N_{5,4}&\le_3 N_{4,4}\le N_{3,4}\le_1 M_{1,4}\le \frac{p_4}{11}\le M_{0,4}\le_1 N_{2,4}\le N_{1,4}\le_3 N_{0,4},\\ N_{5,5}&\le N_{4,5}\le_1 N_{3,5}\le M_{2,5}\le \frac{p_5}{11}\le M_{0,5}\le N_{2,5}\le N_{1,5}\le N_{0,5},\\ N_{5,6}&\le_1 N_{4,6}\le N_{3,6}\le \frac{p_6}{11}\le N_{2,6}\le N_{1,6}\le_1 N_{0,6},\\ N_{5,7}&\le N_{4,7}\le N_{3,7}\le M_{0,7}\le \frac{p_7}{11}\le M_{1,7}\le N_{2,7}\le_1 N_{1,7}\le N_{0,7},\\ N_{5,8}&\le N_{4,8}\le N_{3,8}\le M_{0,8}\le_3 \frac{p_8}{11}\le_3 M_{1,8}\le N_{2,8}\le N_{1,8}\le_3 N_{0,8},\\ N_{5,9}&\le N_{4,9}\le N_{3,9}\le_1 M_{0,9}\le \frac{p_9}{11}\le M_{1,9}\le N_{2,9}\le N_{1,9}\le_2 N_{0,9},\\ N_{5,10}&\le N_{4,10}\le N_{3,10}\le_1 M_{3,10}\le \frac{p_{10}}{11}\le M_{0,10}\le N_{2,10}\le N_{1,10}\le_3 N_{0,10}. \end{aligned}

These inequalities were conjectured by Borozenets and are the subject of the paper's proofs; the supplied source does not explicitly provide a resolution status for this statement.

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Sources & referencesView supporting material

Primary source

Kathrin Bringmann and Badri Vishal Pandey, “Biases among classes of rank-crank partitions11”, arXiv:2308.02327 (2023).

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