Borozenets' rank–crank inequalities modulo 11

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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  (mod c)a\ \, \left( \mathrm{mod} \, c \right). For sequences a={a(n)}n=1∞a=\{a(n)\}_{n=1}^{\infty} and b={b(n)}n=1∞b=\{b(n)\}_{n=1}^{\infty}, write a≤Nba\le_N b when a(n)≤b(n)a(n)\le b(n) for n≥Nn\ge N, and write a≤ba\le b when a(n)≤b(n)a(n)\le b(n) for n≥0n\ge0. For 0≤j,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:

N5,0≤N4,0≤2N3,0≤M1,0≤p011≤M0,0≤1N2,0≤N1,0≤3N0,0,N5,1≤N4,1≤N3,1≤1M0,1≤M2,1≤p111≤M1,1≤1N2,1≤N1,1≤N0,1,N5,2≤N4,2≤N3,2≤M0,2≤p211≤M2,2≤1N2,2≤N1,2≤3N0,2,N5,3≤N4,3≤N3,3≤M1,3≤p311≤M0,3≤N2,3≤1N1,3≤2N0,3,N5,4≤3N4,4≤N3,4≤1M1,4≤p411≤M0,4≤1N2,4≤N1,4≤3N0,4,N5,5≤N4,5≤1N3,5≤M2,5≤p511≤M0,5≤N2,5≤N1,5≤N0,5,N5,6≤1N4,6≤N3,6≤p611≤N2,6≤N1,6≤1N0,6,N5,7≤N4,7≤N3,7≤M0,7≤p711≤M1,7≤N2,7≤1N1,7≤N0,7,N5,8≤N4,8≤N3,8≤M0,8≤3p811≤3M1,8≤N2,8≤N1,8≤3N0,8,N5,9≤N4,9≤N3,9≤1M0,9≤p911≤M1,9≤N2,9≤N1,9≤2N0,9,N5,10≤N4,10≤N3,10≤1M3,10≤p1011≤M0,10≤N2,10≤N1,10≤3N0,10.\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.

References

Primary source

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

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