On the denseness of the invertible group in uniform Fréchet algebras
The authors extend the Arens-Royden theorem to commutative unital Fréchet algebras, provided their maximal ideal spaces satisfy certain conditions concerning their connectedeness. They deal also with the question when a uniform Fréchet algebra has or does not have a dense group of invertible elements.
scientific article; zbMATH DE number 5976605