# Sequences and series....

by Cheman
Tags: sequences, series
 Emeritus Sci Advisor PF Gold P: 11,155 A sequence is an ordered set of terms, {$t_i$} A series is a sum of terms, $\sum t_i$ Mathworld defines a 'progression' as synonymous with 'sequence'. PS : An English dictionary does not necessarily know the mathematical difference between a sequence and a series.