The LaTeX command for cdots (⋯) is \cdots (horizontal ellipsis (centered)).
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Write \cdots inside math mode, that is between $…$ for inline math or in a \[ … \] or equation block for display math. It is part of core LaTeX math, so no extra package is required.
In display math \cdots takes its full size; inline it shrinks to fit the line, and \displaystyle forces the large form. With unicode-math under XeLaTeX or LuaLaTeX, typing ⋯ in a formula gives the same symbol.
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Calculus and analysis symbols in LaTeX: the full table or search all 350+ LaTeX symbols.
Use \cdots in math mode; it needs no extra package. For example, $\cdots f(x)$.
None: \cdots is built into LaTeX, so no extra package is required.