The LaTeX command for infty (∞) is \infty (infinity).
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| Command | Package | Use it when |
|---|---|---|
\infty recommended | none | Infinity. |
-\infty | none | Minus infinity. |
\lim_{x \to \infty} f(x) | none | A limit at infinity, with the condition underneath in display math. |
\sum_{n=1}^{\infty} a_n | none | An infinite series. |
\aleph_0 | none | A cardinal number, when the infinity is a size. |
Write \infty inside math mode, that is between $…$ for inline math or in a \[ … \] or equation block for display math. It is part of core LaTeX math, so no extra package is required.
$\int_0^{\infty} e^{-x}\,dx = 1$Open this example in the live preview: it renders as you type, with no compiler and no signup.
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Use \infty in math mode; it needs no extra package. For example, $\int_0^{\infty} e^{-x}\,dx = 1$.
None: \infty is built into LaTeX, so no extra package is required.
\inf is the infimum operator, not infinity: it prints the word inf.