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  • 1 The University of British Columbia, Vancouver, B.C. Canada V6T 1Z2, Hungary
  • 2 MTA Alfréd Rényi Institute of Mathematics, Budapest, Hungary
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Let forb(m, F) denote the maximum number of columns possible in a (0, 1)-matrix A that has no repeated columns and has no submatrix which is a row and column permutation of F. We consider cases where the configuration F has a number of columns that grows with m. For a k × l matrix G, define s · G to be the concatenation of s copies of G. In a number of cases we determine forb(m, m α · G) is Θ(m k). Results of Keevash on the existence of designs provide constructions that can be used to give asymptotic lower bounds. An induction idea of Anstee and Lu is useful in obtaining upper bounds.

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  • Biró, András (Number theory)
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  • Domokos, Mátyás (Algebra (Ring theory, Invariant theory))
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