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arXiv · 2603.29909

Implication semilattice of 990 quasigroup equational laws

Bruno Le Floch
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Abstract

In his quest to disprove a claim by Peirce that all lattices are distributive, Ernst Schröder considered 135 years ago a list of 990 equational laws on quasigroups, analogous to associativity, such as $(x // y) * z = (y // x) \backslash\backslash z$. A quasigroup is a non-associative analogue of groups, specifically a set equipped with multiplication and right/left conjugate-division operations that are compatible. Each equation of interest identifies two three-variable expressions built from these operations. I determine all $114$ equivalence classes of their conjunctions, and all implications between them. This includes as a small corner the five-element non-distributive lattice identified by Schröder.

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Bruno Le Floch. 2026-03-31. Implication semilattice of 990 quasigroup equational laws. https://arxiv.org/abs/2603.29909

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