We give a representation of the class of all $n$-dimensional copulas such that, for a fixed $m\in \mathbb N$, $2\le m<n$, all their $m$-dimensional margins are equal to the independence copula. Such an investigation originated from an open problem posed by Schweizer and Sklar.
copulas, distributions with given marginals, Fréchet-Hoeffding bounds, partial mutual independence
60E05, 62E10