I have a set $X = \{X_1,\ldots,X_n\}$ where $X_i = [x_1,\ldots,x_m]$ and $x_k$ can be any positive integer value including zero.
I want another set $Y$ such that only the values of $X$ that are greater than zero are included. I was wondering if there is a mathematical notation for this.
For example, let $X_i \in X = [2, 0, 0, 1, 0, 3, 0]$. I want a notation to say that $Y_i \in Y = [2, 1, 3]$ in that order.
Is it correct to say $Y = (X > 0)$ ??, is there a better way to state ?