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Corrigendum to “Congruences for certain binomial sums”

Jung-Jo Lee (2013)

Czechoslovak Mathematical Journal

Theorem 1 of J.-J. Lee, Congruences for certain binomial sums. Czech. Math. J. 63 (2013), 65–71, is incorrect as it stands. We correct this here. The final result is changed, but the essential idea of above mentioned paper remains valid.

Counting biorders.

Christophe, Julie, Doignon, Jean-Paul, Fiorini, Samuel (2003)

Journal of Integer Sequences [electronic only]

Delannoy and tetrahedral numbers

J. Schröder (2007)

Commentationes Mathematicae Universitatis Carolinae

We establish an identity between Delannoy numbers and tetrahedral numbers of arbitrary dimension.

Duality triads of higher rank: Further properties and some examples

Matthias Schork (2006)

Open Mathematics

It is shown that duality triads of higher rank are closely related to orthogonal matrix polynomials on the real line. Furthermore, some examples of duality triads of higher rank are discussed. In particular, it is shown that the generalized Stirling numbers of rank r give rise to a duality triad of rank r.

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