Conjectured joint equidistributions for pairs X^(4)_7 and Y^(4)_7

From papers

Let a mesh pattern be specified by a set of marked points in a 3×33\times3 grid together with a set of shaded cells; let jd\sim_{jd} denote equality of joint distributions for the corresponding mesh-pattern statistics. The conjecture for pairs X7(4)X^{(4)}_7 and Y7(4)Y^{(4)}_7. The two displayed pairs of mesh patterns are jointly equidistributed:

pattern(1/1,2/2,3/3;0/0,0/1,3/0,2/0,2/1,2/2,2/3,3/1,3/3)jdpattern(1/1,2/3,3/2;0/0,0/1,3/0,2/0,2/1,2/2,2/3,3/1,3/3),\operatorname{pattern}(1/1,2/2,3/3;0/0,0/1,3/0,2/0,2/1,2/2,2/3,3/1,3/3)\sim_{jd}\operatorname{pattern}(1/1,2/3,3/2;0/0,0/1,3/0,2/0,2/1,2/2,2/3,3/1,3/3),

and

pattern(1/1,2/2,3/3;0/0,0/2,0/3,1/0,1/2,1/3,2/2,3/2,3/3)jdpattern(1/1,2/3,3/2;0/0,0/2,0/3,1/0,1/2,1/3,2/2,3/2,3/3).\operatorname{pattern}(1/1,2/2,3/3;0/0,0/2,0/3,1/0,1/2,1/3,2/2,3/2,3/3)\sim_{jd}\operatorname{pattern}(1/1,2/3,3/2;0/0,0/2,0/3,1/0,1/2,1/3,2/2,3/2,3/3).

These are conjectured joint equidistributions of mesh patterns; the source provides no resolution, so their status remains open.

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Sources & referencesView supporting material

Primary source

Shuzhen Lv and Philip B. Zhang, “Joint equidistributions of mesh patterns 123 and 132 with minus antipodal shadings”, arXiv:2506.23148 (2025).

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