The algebra structure of linear functionals on polynomials of a single variable (Roman 1984, pp. 2-3).
Umbral Algebra
See also
Umbral CalculusExplore with Wolfram|Alpha
References
Roman, S. "The Umbral Algebra." §2.1 in The Umbral Calculus. New York: Academic Press, pp. 6-12, 1984.Referenced on Wolfram|Alpha
Umbral AlgebraCite this as:
Weisstein, Eric W. "Umbral Algebra." From MathWorld--A Wolfram Web Resource. https://mathworld.wolfram.com/UmbralAlgebra.html