In this paper, we use group algebras and semigroup algebras to provide counterexamples that demonstrate the failure of [11, Theorem 2.1, Proposition 3.2]. Additionally, we revisit and refine their results. Specifically, we establish that if A is a ...
In this paper, we use group algebras and semigroup algebras to provide counterexamples that demonstrate the failure of [11, Theorem 2.1, Proposition 3.2]. Additionally, we revisit and refine their results. Specifically, we establish that if A is a 𝜑-biprojective Banach algebra with a closed ideal I such that ${\bar{AI}}=I$, then A/I is ${\tilde{\varphi}}$-biprojective. Lastly, we explore the connection between 𝜑-approximate Helemskii biflatness and 𝜑-pseudo amenability.