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:
“One of the most difficult aspects of being a parent during the middle years is feeling powerless to protect our children from hurt. However “growthful” it may be for them to experience failure, disappointment and rejection, it is nearly impossible to maintain an intellectual perspective when our sobbing child or rageful child comes in to us for help. . . . We can’t turn the hurt around by kissing the sore spot to make it better. We are no longer the all-powerful parent.”
—Ruth Davidson Bell (20th century)