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High nonassociativity in order 8 and an associative index estimate
Authors:Ale&#x; Drpal  Viliam Valent
Institution:Ale? Drápal,Viliam Valent
Abstract:Let urn:x-wiley:10638539:media:jcd21632:jcd21632-math-0001 be a quasigroup. Put urn:x-wiley:10638539:media:jcd21632:jcd21632-math-0002 and assume that urn:x-wiley:10638539:media:jcd21632:jcd21632-math-0003. Let urn:x-wiley:10638539:media:jcd21632:jcd21632-math-0004 and urn:x-wiley:10638539:media:jcd21632:jcd21632-math-0005 be the number of left and right translations of urn:x-wiley:10638539:media:jcd21632:jcd21632-math-0006 that are fixed point free. Put urn:x-wiley:10638539:media:jcd21632:jcd21632-math-0007. Denote by urn:x-wiley:10638539:media:jcd21632:jcd21632-math-0008 the number of idempotents of urn:x-wiley:10638539:media:jcd21632:jcd21632-math-0009. It is shown that urn:x-wiley:10638539:media:jcd21632:jcd21632-math-0010. Call urn:x-wiley:10638539:media:jcd21632:jcd21632-math-0011 extremely nonassociative if urn:x-wiley:10638539:media:jcd21632:jcd21632-math-0012. The paper reports what seems to be the first known example of such a quasigroup, with urn:x-wiley:10638539:media:jcd21632:jcd21632-math-0013, urn:x-wiley:10638539:media:jcd21632:jcd21632-math-0014, and urn:x-wiley:10638539:media:jcd21632:jcd21632-math-0015. It also provides supporting theory for a search that verified urn:x-wiley:10638539:media:jcd21632:jcd21632-math-0016 for all quasigroups of order urn:x-wiley:10638539:media:jcd21632:jcd21632-math-0017.
Keywords:associative triple  associativity index  combinatorial inequality  quasigroup
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