\dots
Ellipsis, used to indicate continuation or omission in mathematical expressions or text.
Represents a sequence of numbers from 1 to n.
1, 2, \dots, n
Indicates the sum of a series of terms.
a_1 + a_2 + \dots + a_n
Denotes a list of variables or elements.
x_1, x_2, \dots, x_n