On Bounded Weak Approximate Identities and a New Version of Them

In this paper, we give a short survey of results and problems concerning the notion of bounded weak approximate identities in Banach algebras. Also, we introduce a new version of approximate identities and give one illuminating example to show the difference.

کلیدواژه ها:

Banach algebra ، (bounded weak) approximate identity ، Fourier algebra ، semigroup algebra ، group algebra