Derivations into duals of closed ideals of Banach algebras

M. Eshaghi Gordji, B. Hayati, S. A. R. Hosseiniun

Let $\mathcal{A}$ be a Banach algebra. We study those closed ideals $I$ of $\mathcal{A}$ for which the first cohomology group of $\mathcal{A}$ with coefficients in $I^{\ast }$ is trivial; i.e. $H^1(\ca…