\ldots

Ellipsis, used to indicate continuation or omission in mathematical expressions or text.

Examples

Indicating a sequence of numbers from 1 to n.

1, 2, 3, \ldots, n

Summation of a series of terms.

a_1 + a_2 + \ldots + a_n

List of variables or elements in a set.

x_1, x_2, \ldots, x_n