# Sequence

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The position of an element in a sequence is its rank or index; it is the natural number for which the element is the image. The first element has index 0 or 1, depending on the context or a specific convention. In mathematical analysis, a sequence is often denoted by letters in the form of ${\displaystyle a_{n}}$, ${\displaystyle b_{n}}$ and ${\displaystyle c_{n}}$, where the subscript n refers to the nth element of the sequence; for example, the nth element of the Fibonacci sequence ${\displaystyle F}$ is generally denoted as ${\displaystyle F_{n}}$.