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math.CO2021
A Sufficient Condition for a Quandle to be Latin
António Lages, Pedro Lopes, Petr Vojtěchovský
A quandle is an algebraic structure satisfying three axioms: idempotency, right-invertibility and right self-distributivity. In quandles, right translations are permutations. The p…
math.CO2021★ 1 cited
Division sudokus: Invariants, enumeration and multiple partitions
Aleš Drápal, Petr Vojtěchovský
A division sudoku is a latin square whose all six conjugates are sudoku squares. We enumerate division sudokus up to a suitable equivalence, introduce powerful invariants of divisi…