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Quasigroup Identities and Mendelsohn Designs

Published online by Cambridge University Press:  20 November 2018

F. E. Bennett*
Affiliation:
Mount Saint Vincent University, Halifax, Nova Scotia
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A quasigroup is an ordered pair (Q, •), where Q is a set and (•) is a binary operation on Q such that the equations ax — b and ya — b are uniquely solvable for every pair of elements a,b in Q. It is well-known (see, for example, [11]) that the multiplication table of a quasigroup defines a Latinsquare, that is, a Latin square can be viewed as the multiplication table of a quasigroup with the headline and sideline removed. We are concerned mainly with finite quasigroups in this paper. A quasigroup (Q, •) is called idempotent if the identity x2 = x holds for all x in Q.

Type
Research Article
Copyright
Copyright © Canadian Mathematical Society 1989

References

1. Bennett, F.E., The spectra of a variety of quasi groups and related combinatorial designs, Annals of Discrete Math., in press.Google Scholar
2. Bennett, F.E., On a class of n x 4 orthogonal arrays and associated quasigroups, Congressus Numerantium 39 (1983), 117122.Google Scholar
3. Bennett, F.E., Conjugate orthogonal Latin squares and Mendelsohn designs, Ars Combinatoria 19 (1985), 5162.Google Scholar
4. Bennett, F.E., On r-fold perfect Mendelsohn designs, Ars Combinatoria 23 (1987), 5768.Google Scholar
5. Bennett, F.E., Mendelsohn, E. and Mendelsohn, N.S., Resolvable perfect cyclic designs, J. Combinatorial Theory (A) 29 (1980), 142150.Google Scholar
6. Bennett, F.E., Lisheng Wu and Zhu, L., Conjugate orthogonal Latin squares with equal-sized holes, Annals of Discrete Math. 34 (1987), 6580.Google Scholar
7. Bennett, F.E., On the existence of COLS with equal-sized holes, Ars Combinatoria to appear.Google Scholar
8. Th. Beth, Jungnickel, D. and Lenz, H., Design theory (Bibliographisches Institut, Zurich, 1985).Google Scholar
9. Brouwer, A.E., The number of mutually orthogonal Latin squares - a table up to order 10000, Research Report ZW123/79 (Mathematisch Centrum, Amsterdam, 1979).Google Scholar
10. Brouwer, A.E., Hanani, H. and Schrijver, A., Group divisible designs with block-size four, Discrete Math. 20 (1977), 110.Google Scholar
11. Dénes, J. and Keedwell, A.D., Latin squares and their applications (Academic Press, New York and London, 1974).Google Scholar
12. Dinitz, J.H. and Stinson, D.R., MOLS with holes, Discrete Math. 44 (1983), 145154.Google Scholar
13. Evans, T., Algebraic structures associated with Latin squares and orthogonal arrays, Proc. Conf. Algebraic Aspects of Combinatorics, Congressus Numerantium 13 (1975), 3152.Google Scholar
14. Evans, T., Universal-algebraic aspects of combinatorics, Proc. Internat. Conf. Universal Algebra, Janos Bolyai Math. Soc. (North-Holland, Amsterdam, 1980).Google Scholar
15. Evans, T., Finite representations of two-variable identities or Why are finite fields important in combinatories! Annals of Discrete math. 15 (1982), 135141.Google Scholar
16. Ganter, B., Combinatorial designs and algebras, Preprint Nr. 270 (Technische Hochschule, Darmstadt, 1976).Google Scholar
17. Hanani, H., Balanced incomplete block designs and related designs. Discrete Math. 11 (1975), 255369.Google Scholar
18. Hanani, H., Ray-Chaudhuri, D.K. and Wilson, R.M., On resolvable designs, Discrete Math. 3 (1972), 343357.Google Scholar
19. Horton, J.D., Sub-Latin squares and incomplete orthogonal arrays, J. Combinatorial Theory (A) 16 (1974), 2333.Google Scholar
20. Hsu, D.F. and Keedwell, A.D., Generalized complete mappings, neofields, sequenceable groups and block designs. 11, Pacific J. Math. 117 (1985), 291312.Google Scholar
21. Keedwell, A.D., Circuit designs and Latin squares, Ars Combinatoria 17 (1984), 7990.Google Scholar
22. Lindner, C.C., Quasigroup identities and orthogonal arrays, in: Surveys in combinatorics, London Math. Soc. Lecture Notes Ser. 82 (Cambridge Univ. Press, 1983), 77- 105.Google Scholar
23. Lindner, C.C., Construction of quasigroups satisfying the identity x(xy) = yx, Canad. Math. Bull. 14 (1971), 5759.Google Scholar
24. Lindner, C.C., Identities preserved by the singular direct product, Algebra Universalis l ( 1971 ), 8689.Google Scholar
25. Lindner, C.C., Identities preserved by the singular direct product II, Algebra Universalis 2 (1972), 113117.Google Scholar
26. Lindner, C.C., Construction of quasigroups using the singular direct product, Proc. Amer. Math. Soc. 29(1971), 263266.Google Scholar
27. Lindner, C.C., Identities preserved by group divisible designs, preprint.Google Scholar
28. Lindner, C.C., Mendelsohn, N.S. and Sun, S.R., On the construction of Schroeder quasigroups, Discrete Math. 32 (1980), 271280.Google Scholar
29. Lindner, C.C. and Steedly, D., On the number of conjugates of a quasigroup, Algebra Universalis 5 (1975), 191196.Google Scholar
30. MacNeish, H.F., Euler squares, Ann. Math. 23 (1922), 221227.Google Scholar
31. Mendelsohn, N.S., Combinatorial designs as models of universal algebras in: Recent progress in combinatorics (Academic Press, New York and London, 1969), 123132.Google Scholar
32. Mendelsohn, N.S., A natural generalization of Steiner triple systems, in: Computers in number theory (Academic Press, New York, 1971), 323338.Google Scholar
33. Mendelsohn, N.S., Perfect cyclic designs, Discrete Math. 20 (1977), 6368.Google Scholar
34. Mendelsohn, N.S., Algebraic construction of combinatorial designs, Proc. Conf. Algebraic Aspects of Combinatorics, Congressus Numerantium 13 (1975), 157168.Google Scholar
35. Mullin, R.C., A generalization of the singular direct product with application to skew Room squares, J. Combinatorial Theory (A) 29 (1980), 306318.Google Scholar
36. Mullin, R.C., Schellenberg, P.J., Vanstone, S.A. and Wallis, W.D., On the existence of frames, Discrete Math. 37 (1981), 79104.Google Scholar
37. Mullin, R.C. and Stinson, D.R., Pairwise balanced designs with odd block sizes exceeding 5, Discrete Math., to appear.Google Scholar
38. Sade, A., Produit direct-singulier de quasigroupes orthogonaux et anti-abéliens, Ann. Soc. Sci. Bruxelles Sér. I 74 (1960), 9199.Google Scholar
39. Seiden, E., A method of construction of resolvable BIBD, Sankhya (A) 25 (1963), 393394.Google Scholar
40. Stein, S.K., On the foundations of quasigroups, Trans. Amer. Math. Soc. 85 (1957), 228256.Google Scholar
41. Stein, S.K., Homogeneous quasigroups, Pacific J. Math. 14 (1964), 10911102.Google Scholar
42. Stinson, D.R. and Zhu, L., On the existence o/MOLS with equal-sized holes, Aequationes Math. 33 (1987), 96105.Google Scholar
43. Todorov, D.T., Three mutually orthogonal Latin squares of order 14, Ars Combinatoria 20 (1985), 45-8.Google Scholar
44. Wilson, R.M., Concerning the number of mutually orthogonal Latin squares, Discrete Math. 9 (1974), 181198.Google Scholar
45. Wilson, R.M., Constructions and uses of pairwise balanced designs, Mathematical Centre Tracts 55 (1974), 18-1.Google Scholar
46. Wilson, R.M., An existence theory for pairwise balanced designs I, J. Combinatorial Theory (A) 13 (1972), 220245.Google Scholar
47. Wilson, R.M., An existence theory for pairwise balanced designs II, J. Combinatorial Theory (A) 13 (1972), 246273.Google Scholar
48. Wilson, R.M., An existence theory for pairwise balanced designs III, J. Combinatorial Theory (A) 18 (1975), 7179.Google Scholar