Why Delannoy numbers?

This article is not a research paper, but a little note on the history of combinatorics: we present here a tentative short biography of Henri Delannoy, and a survey of his most notable works. This answers the question raised in the title, as these works are related to lattice paths enumeration, to the so-called Delannoy numbers, and were the first general way to solve Ballot-like problems.

• Type: Journal
• Year: 2004
• Where: CORR
• Authors: Cyril Banderier, Sylviane R. Schwer
• Keywords: CORR 2004, Education, Little Note, So-called Delannoy Numbers, Tentative Short Biography