# American Institue of Mathematical Sciences

2017, 11(1): 179-185. doi: 10.3934/amc.2017011

## Codes from Hall planes of odd order

 Institute of Mathematics, Physics and Computer Science Aberystwyth University, Aberystwyth SY23 3BZ, UK

Received  August 2015 Published  February 2017

We show explicitly that the dimension of the ternary code of the Hall plane of order 9 is greater than the dimension of the ternary code of the desarguesian plane of order 9. The proof requires finding a word with some defined properties in the dual ternary code of the desarguesian plane of order 9. The idea can be generalised for other orders, provided that words in the dual code of the desarguesian projective plane that have the specified properties can be found.
Citation: J. D. Key, T. P. McDonough, V. C. Mavron. Codes from Hall planes of odd order. Advances in Mathematics of Communications, 2017, 11 (1) : 179-185. doi: 10.3934/amc.2017011
##### References:
 [1] E. F. Assmus Jr, J. D. Key, Designs and Their Codes, Cambridge Univ. Press, Cambridge, 1992. [2] W. Bosma, J. Cannon, C. Playoust, The Magma algebra system Ⅰ: the user language, J. Symb. Comput., 24 (1997), 235-265. [3] J. Cannon, A. Steel and G. White, Linear codes over finite fields, in Handbook of Magma Functions (eds. J. Cannon and W. Bosma), Computational Algebra Group, Dep. Math. , Univ. Sydney, 2006, V2. 13,3951-4023. [4] P. Dembowski, Finite geometries, in Ergebnisse der Mathematik und ihrer Grenzgebiete, Springer-Verlag, Berlin, 1968. [5] The GAP Group, GAP -Groups, Algorithms, and Programming, Version 4. 4. 12,2008, available at http://www.gap-system.org. [6] D. Ghinelli, M. J. de Resmini, J. D. Key, Minimum words of codes from affine planes, J. Geom., 91 (2008), 43-51. [7] D. R. Hughes and F. C. Piper, Projective Planes, Springer-Verlag, New York, 1973. [8] J. D. Key, M. J. de Resmini, Small sets of even type and codewords, J. Geom., 61 (1998), 83-104. [9] J. D. Key, T. P. McDonough, V. C. Mavron, An upper bound for the minimum weight of the dual codes of desarguesian planes, Europ. J. Combin., 30 (2009), 220-229. [10] J. D. Key, T. P. McDonough, V. C. Mavron, Codes from Hall planes of even order, J. Geom., 105 (2014), 33-41. [11] H. Lüneburg, Translation Planes, Springer-Verlag, New York, 1980. [12] T. G. Ostrom, Finite Translation Planes, Springer-Verlag, 1970.

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##### References:
 [1] E. F. Assmus Jr, J. D. Key, Designs and Their Codes, Cambridge Univ. Press, Cambridge, 1992. [2] W. Bosma, J. Cannon, C. Playoust, The Magma algebra system Ⅰ: the user language, J. Symb. Comput., 24 (1997), 235-265. [3] J. Cannon, A. Steel and G. White, Linear codes over finite fields, in Handbook of Magma Functions (eds. J. Cannon and W. Bosma), Computational Algebra Group, Dep. Math. , Univ. Sydney, 2006, V2. 13,3951-4023. [4] P. Dembowski, Finite geometries, in Ergebnisse der Mathematik und ihrer Grenzgebiete, Springer-Verlag, Berlin, 1968. [5] The GAP Group, GAP -Groups, Algorithms, and Programming, Version 4. 4. 12,2008, available at http://www.gap-system.org. [6] D. Ghinelli, M. J. de Resmini, J. D. Key, Minimum words of codes from affine planes, J. Geom., 91 (2008), 43-51. [7] D. R. Hughes and F. C. Piper, Projective Planes, Springer-Verlag, New York, 1973. [8] J. D. Key, M. J. de Resmini, Small sets of even type and codewords, J. Geom., 61 (1998), 83-104. [9] J. D. Key, T. P. McDonough, V. C. Mavron, An upper bound for the minimum weight of the dual codes of desarguesian planes, Europ. J. Combin., 30 (2009), 220-229. [10] J. D. Key, T. P. McDonough, V. C. Mavron, Codes from Hall planes of even order, J. Geom., 105 (2014), 33-41. [11] H. Lüneburg, Translation Planes, Springer-Verlag, New York, 1980. [12] T. G. Ostrom, Finite Translation Planes, Springer-Verlag, 1970.
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