Infinite expression

In mathematics, an infinite expression is an infinite series, such as

$\sum _{n=0}^{\infty }a_{n}\,,$

an infinite product, such as

$\prod _{n=0}^{\infty }b_{n}\,,$

or an infinite continued fraction, such as

$c_{0}+{\cfrac {1}{c_{1}+{\cfrac {1}{c_{2}+{\cfrac {1}{c_{3}+{\cfrac {1}{c_{4}+\ddots }}}}}}}}\,.$

[1], [2], [3], [4], [5]