# American Institute of Mathematical Sciences

November  2017, 11(4): 777-790. doi: 10.3934/amc.2017057

## Counting generalized Reed-Solomon codes

 1 Department of Applied Mathematics and Computer Science, Technical University of Denmark, Matematiktorvet 303B, DK-2800 Kgs. Lyngby, Denmark 2 School of Computer Science, Engineering and Mathematics, Flinders University, GPO Box 2100, Adelaide, SA 5001, Australia 3 Department of Mathematics King Abdulaziz University, Jeddah 21859, Saudi Arabia 4 Department of Mathematics, Indian Institute of Science Education and Research (IISER), Dr. Homi Bhabha Road, Pashan, Pune 411008, India

Received  May 2016 Published  November 2017

In this article we count the number of $[n, k]$ generalized Reed-Solomon (GRS) codes, including the codes coming from a non-degenerate conic plus nucleus. We compare our results with known formulae for the number of $[n, 3]$ MDS codes with $n=6, 7, 8, 9$.

Citation: Peter Beelen, David Glynn, Tom Høholdt, Krishna Kaipa. Counting generalized Reed-Solomon codes. Advances in Mathematics of Communications, 2017, 11 (4) : 777-790. doi: 10.3934/amc.2017057
##### References:
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##### References:
 [1] S. Ball, On sets of vectors of a finite vector space in which every subset of basis size is a basis, J. Eur. Math. Soc., 14 (2012), 733-748. Google Scholar [2] S. Ball and J. De Beule, On sets of vectors of a finite vector space in which every subset of basis size is a basis Ⅱ, Des. Codes Cryptography, 65 (2012), 5-14. doi: 10.1007/s10623-012-9658-6. Google Scholar [3] W.-L. Chow, On the geometry of algebraic homogeneous spaces, Annals of Mathematics. Second Series, 50 (1949), 32-67. doi: 10.2307/1969351. Google Scholar [4] P. Dembowski, Finite Geometries Springer, 1968. Google Scholar [5] A. Dür, The automorphism groups of Reed-Solomon codes, J. Comb. Theory, Series A, 44 (1987), 69-82. doi: 10.1016/0097-3165(87)90060-4. Google Scholar [6] D. Eisenbud, Commutative Algebra: With a View Toward Algebraic Geometry, volume 150 of Graduate Texts in Mathematics, Springer-Verlag, New York, 1995. Google Scholar [7] S. R. Ghorpade and G. Lachaud, Hyperplane sections of Grassmannians and the number of MDS linear codes, Finite Fields and Their Applications, 7 (2001), 468-506. doi: 10.1006/ffta.2000.0299. Google Scholar [8] D. G. Glynn, The non-classical 10-arc of $\mathrm{PG}(4,9)$, Discrete Mathematics, 59 (1986), 43-51. Google Scholar [9] D. G. Glynn, Rings of geometries, Ⅱ, J. Comb. Theory, Series A, 49 (1988), 26-66. doi: 10.1016/0097-3165(88)90027-1. Google Scholar [10] D. G. Glynn, Every oval of $\text{PG}(2,q)$, $q$ even, is the product of its external lines, Bull. Inst. Combin. Appl., 9 (1993), 65-68. Google Scholar [11] D. G. Glynn, A condition for arcs and MDS codes, Designs Codes and Cryptography, 58 (2011), 215-218. doi: 10.1007/s10623-010-9404-x. Google Scholar [12] D. G. Glynn, An invariant for hypersurfaces in prime characteristic, SIAM Journal on Discrete Mathematics, 26 (2012), 881-883. doi: 10.1137/110823274. Google Scholar [13] P. Griffiths and J. Harris, Principles of Algebraic Geometry, John Wiley & Sons, New York, 1978. Google Scholar [14] J. Harris, Algebraic Geometry: A First Course, Springer-Verlag, New York, 1995. Google Scholar [15] J. W. P. Hirschfeld, Finite Projective Spaces of Three Dimensions The Clarendon Press, Oxford University Press, New York, 1985. Google Scholar [16] J. W. P. Hirschfeld, Projective Geometries over Finite Fields, Oxford Mathematical Monographs, The Clarendon Press, Oxford University Press, New York, second edition, 1998. Google Scholar [17] J. W. P. Hirschfeld, G. Korchmaros and F. Torres, Algebraic Curves over a Finite Field, Princeton University Press, Princeton, NJ, 2008. Google Scholar [18] J. W. P. Hirschfeld and J. A. Thas, General Galois Geometries, Springer Monographs in Mathematics, Springer, London, 2016. Google Scholar [19] A. V. Iampolskda, A. N. Skorobogatov and E. A. Sorokin, Formula for the number of $[9,3]$ MDS codes, IEEE Trans. Inf. Theory, 41 (1995), 1667-1671. doi: 10.1109/18.476239. Google Scholar [20] K. V. Kaipa, An asymptotic formula in $q$ for the number of $[n,k]$ $q$-ary MDS codes, IEEE Trans. Inf. Theory, 60 (2014), 7047-7057. doi: 10.1109/TIT.2014.2349903. Google Scholar [21] R. Rolland, The number of MDS $[7,3]$ codes on finite fields of characteristic $2$, Appl. Algebra Engrg. Comm. Comput., 3 (1992), 301-310. doi: 10.1007/BF01294838. Google Scholar [22] B. Segre, Lectures on Modern Geometry, Edizioni Cremonese, Roma, 1961. Google Scholar [23] R. C. Singleton, Maximum distance $q$-nary codes, IEEE Trans. Information Theory, 10 (1964), 116-118. Google Scholar
Number of GRS and MDS codes of small length and dimension 3
 $q$ $n$ $\#$ GRS $\#$ MDS $4$ $6$ $486$ $486$ $5$ $6$ $6144$ $6144$ $7$ $6$ $466560$ $1088640$ $7$ $7$ $5598720$ $5598720$ $7$ $8$ $33592320$ $33592320$ $8$ $6$ $2016840$ $6554730$ $8$ $7$ $42353640$ $141178800$ $8$ $8$ $592950960$ $2964754800$ $8$ $9$ $4150656720$ $41506567200$ $8$ $10$ $290545970400$ $290545970400$ $9$ $6$ $6881280$ $28901376$ $9$ $7$ $220200960$ $1604321280$ $9$ $8$ $5284823040$ $15854469120$ $9$ $9$ $84557168640$ $84557168640$ $9$ $10$ $676457349120$ $676457349120$
 $q$ $n$ $\#$ GRS $\#$ MDS $4$ $6$ $486$ $486$ $5$ $6$ $6144$ $6144$ $7$ $6$ $466560$ $1088640$ $7$ $7$ $5598720$ $5598720$ $7$ $8$ $33592320$ $33592320$ $8$ $6$ $2016840$ $6554730$ $8$ $7$ $42353640$ $141178800$ $8$ $8$ $592950960$ $2964754800$ $8$ $9$ $4150656720$ $41506567200$ $8$ $10$ $290545970400$ $290545970400$ $9$ $6$ $6881280$ $28901376$ $9$ $7$ $220200960$ $1604321280$ $9$ $8$ $5284823040$ $15854469120$ $9$ $9$ $84557168640$ $84557168640$ $9$ $10$ $676457349120$ $676457349120$
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