On Krawtchouk polynomials
  Krawtchouk polynomials play an important role in coding theory and are also useful in graph theory and number theory. Although the basic properties of these polynomials are to some extent known, there is, to my knowledge, no detailed development available. My aim in writing this article is to fill in this gap. 
Rodney Coleman (LJK)
math.CA cs.IT math.IT