On the coefficients of the characteristic series of the U-operator

A conceptual proof is given of the fact that the coefficients of the characteristic series of the U-operator acting on families of overconvegent modular forms lie in the Iwasawa algebra.

Radioisotope applications of industrial significance as listed in "Isotopes - a five-year summary of U.S. distribution."

April 1952 [TIS Issuance Date].