Bell and Riordan
In the 1930s and 1940s, Eric Temple Bell tried unsuccessfully to make this kind of argument logically rigorous. The combinatorialist John Riordan in his book Combinatorial Identities published in the 1960s, used techniques of this sort extensively.
Read more about this topic: Umbral Calculus
Famous quotes containing the word bell:
“When a nation’s young men are conservative, its funeral bell is already rung.”
—Henry Ward Beecher (1813–1887)