I have a series of terms $\{t_n : t_n = a_n x_n\}$, and I want to talk about the product of each term except $t_j$.
Would any of these be an appropriate way to say that? I like this:
$$\prod_{i \ne j} t_i$$
or maybe this
$$\prod_{i=1,i \ne j}^n t_i$$
Is it a normal thing to do, to put qualifiers on an index like that, or is there a better way to do it?
Or would it be better to make a subset, $\{b_n : a_n, n \ne j \}$ and use that:
$$\prod_{i=1}^n b_i$$