Pronunciation of Indexed Collection of Sets

Question

I'm currently learning about sets and I want to discuss the material. However, I'm unsure of the pronunciation of certain symbols.

For instance, I know that

(1) $A\cup B$ is read, "A union B."
(2) $A\cap B$ is read, "A intersection B."

However, I'm unsure about the pronunciation of symbols for the difference of two sets, an indexed collection of sets, and its union (or intersection). How are the following symbols pronounced when discussed with another person?

(3) $A-B$

(4) $\{S_\alpha\}_{\alpha\in I}$

(5) $\bigcup_{\alpha\in I}S_\alpha$

(6) $\bigcup_{i=1}^n A_i$

Answer 1

I'd say:

(3) "$A$ minus $B$", or "$A$ setminus $B$";

(4) "the family of the $S$-sub-$a$, for $a$ in $I$", or "the family $S$-sub-$a$, $a$ in $I$";

(5) "union of [the] $S$-sub-$a$, [for] $a$ in $I$";

(6) "union of [the] $A$-sub-$i$, [for] $i$ equals $1$ to $n$".

Words in brackets are optional — sometimes you might say them, sometimes not, depending on where in a sentence the phrase occurs.