Entropic groupoids or medial groupoids
[Thanks to Alar Leibak, aleibak@ioc.ee, for helping to construct this page]
Definition
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A groupoid+(ab)(cd)=(ac)(bd).
Examples
Structure
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Representation
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Decision problems
- Identity problem:
- Word problem:
Spectra and growth
- Finite spectrum:
- Free spectrum:
- Growth series:
History/Importance
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References
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Jaroslav Je\v{z}ek, Thom\acute{a}\v{s} Kepka, Medial Groupoids,
1983, Academia Praha.
Subsystems
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A Catalogue of Algebraic Systems / John Pedersen / jfp@math.usf.edu