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cs.CG2026
Some results on Archdeacon's conjecture for rotation systems
Arahat Chikkatur, Ji Zeng
A rotation system on elements assigns to each element a cyclic order of the other elements. A four-element subset is non-planar if its induced rotation system cannot be r…
cs.CG2026
On balanced circuits in uniform rank-three oriented matroids
Ji Zeng
A set of four points on the sphere is a balanced quadruple if there are four real numbers , two positive and two negative, such that $s_1p_1+…