Sequences

A *sequence* is an infinite list of numbers, like

The numbers in the sequence are called its

The notations or are abbreviations for

For some sequences, it is possible to give an *explicit formula*
for : this means that is expressed as a function of .
For instance, the sequence (1) above can be described by
the explicit formula
.

Zvezdelina Stankova-Frenkel 2000-09-20