input is usually written by a notation such as , or just as Here is the domain, or index set, of the sequence.

Finite and infinite

The length of a sequence is defined as the number of terms in the sequence.

A sequence of a finite length is a finite sequence. A finite sequence of length is also called an {{mvar. Finite sequences include the empty sequence, denoted , that has no elements.

Normally, the term infinite sequence refers to a sequence that is infinite

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