Steiner loops satisfying moufang’s theorem

Charles Colbourn, Maria De Lourdes Merlini Giuliani, Alexander Rosa, Izabella Stuhl

Research output: Contribution to journalArticlepeer-review

5 Scopus citations


A loop satisfies Moufang’s theorem whenever the subloop generated by three associating elements is a group. Moufang loops (loops that satisfy the Moufang identities) satisfy Moufang’s theorem, but it is possible for a loop that is not Moufang to nevertheless satisfy Moufang’s theorem. Steiner loops that are not Moufang loops are known to arise from Steiner triple systems in which some triangle does not generate a subsystem of order 7, while Steiner loops that do not satisfy Moufang’s theorem are shown to arise from Steiner triple systems in which some quadrilateral (Pasch configuration) does not generate a subsystem of order 7. Consequently, the spectra of values of v for which a Steiner loop exists are determined when the loop is also Moufang; when the loop is not Moufang yet satisfies Moufang’s theorem; and when the loop does not satisfy Moufang’s theorem. Furthermore, examples are given of non-commutative loops that satisfy Moufang’s theorem yet are not Moufang loops.

Original languageEnglish (US)
Pages (from-to)170-181
Number of pages12
JournalAustralasian Journal of Combinatorics
Issue number1
StatePublished - Aug 20 2015

ASJC Scopus subject areas

  • Discrete Mathematics and Combinatorics


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