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\infty is in base LaTeX and needs no package. It appears most often in limits, integral bounds and interval notation. The cardinal infinities of set theory are a different symbol, \aleph.
All ways to write it
| Command | Use | Package | Copy |
|---|---|---|---|
\infty | — | none | |
-\infty | negative infinity | none | |
\lim_{x \to \infty} | in a limit | none | |
\aleph_0 | aleph-null, countable infinity ℵ₀ | none |
Example
\sum_{n=1}^{\infty} \frac{1}{n^2} = \frac{\pi^2}{6}The Basel problem.
Questions
How do I write an infinite interval?
(-\infty, a] or [a, \infty). Infinity is always open, so use a parenthesis on that side.
Related symbols
- Limit lim
\lim_{x \to a} f(x) - Integral ∫
\int_{a}^{b} f(x)\,dx - Summation ∑
\sum_{i=1}^{n} - Arrows →
\rightarrow
Using infinity in Confluence
Confluence Cloud has no built-in LaTeX. With LaTeX Math for Confluence you add a math macro to any page, type \infty and it renders inline or as a block, with a live preview while you edit. Every command on this page renders there without extra packages.