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Journal of Combinatorics
Article . 2010 . Peer-reviewed
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A symmetrical Eulerian identity

Authors: Fan Chung; Ron Graham; Don Knuth;

A symmetrical Eulerian identity

Abstract

Eulerian numbers, introduced by Euler in 1736 [5], while not as ubiquitous as the more familiar Bernoulli numbers, Stirling numbers, harmonic numbers, or binomial coefficients, nevertheless arise in a variety of contexts in enumerative combinatorics, for example, in the enumeration of permutations with a given number of descents [7]. Because the recurrence for Eulerian numbers is a bit more complicated than for many other families of special numbers, and because they increase in size rather rapidly, it was stated in [7] that, “We don’t expect the Eulerian numbers to satisfy as many simple identities.” Nevertheless, the following identity is rather elegant and appears to be new.

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selected citations
These citations are derived from selected sources.
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
1
Average
Average
Average
bronze