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I asked a question on this post
should I put ... at the end?
in case someone is not familiar to sequence-of-sets, this could be viewed as a punctuation at the end of a sentence (bad analogy).
following expression, which is more appropriate?
expression_1:
should I put ... at the end?
expression_2:
do I need to put ... at the end?
I would say that "should" implies some sort of option, where it is more of a suggestion. Whereas "need to" implies necessity (obviously ;-) which means that any other option leaves something out.
In the case of your original question, if you do not write "…" (horizontal ellipsis U+2026) at the end, then you are referencing a (possibly) finite set.
