In a paper, I find the expression "Let $\{X(Y_k) | Y_k\}_{k=0,1, \cdots}$ be mutually independent"
Q: What does this notation mean? Does somebody know it? Is it some kind of conditional independence? How do I have to define it well?
For every $d \in R^n$, $X(d): \Omega \to R$ is a random variable, $Y_k: \Omega \to R^n$.