Single-variable calculus from first principles
A sequence is an ordered, never-ending list of numbers: a first term, a second, a third, and so on forever. We write the term in position n as aₙ, so the whole list is a₁, a₂, a₃, … The little subscript n is just a position label: term number 1, term number 2, term number 7.
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▶ Sequences