Specifying it as { p1, p2, p3, ... , pt } kind of removes any ambiguity, most people will infer that it starts with p1, that the subscript increments by 1 each time, and ends at t also implying there are t terms in total.
@Greenbank started
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Specifying it as { p1, p2, p3, ... , pt } kind of removes any ambiguity, most people will infer that it starts with p1, that the subscript increments by 1 each time, and ends at t also implying there are t terms in total.