Characterization of φ-biflatness of hypergroup algebras

In this paper, we investigate biflatness and φ-biflatness of hypergroup algebras. Indeed, we show that unlike the group case biflatness of the hypergroup algebra $L^{1}(K)$ is not equivalent to amenability of K. Moreover, we characterize φ-biflatness of the hypergroup algebra $L^{1}(K)$, in .terms of the amenability of K