plethory

A **plethory** is a monoid object in the monoidal category of birings. The most famous example of such a creature is $\Lambda$, the ring of symmetric polynomials. See:

- J. Borger, B. Wieland, Plethystic algebra,
*Advances in Mathematics***194**(2005), 246–283. (web)

Created on June 29, 2010 00:31:03
by John Baez
(99.11.157.15)