Symbols and Punctuation symbol
\dotsiThe command \dotsi is used in LaTeX to produce ellipsis (three dots) in mathematical expressions, typically used in series or sequences. It is a variant of the \dots command, specifically designed to be used in mathematical contexts where the dots are followed by a binary operator or a relation.
Ellipsis in a series of additions
a_1 + a_2 + \dotsi + a_nEllipsis in a sequence of variables
x_1, x_2, \dotsi, x_nEllipsis in a product sequence
1 \cdot 2 \cdot \dotsi \cdot n