# \epsilon

The ϵ symbol (Greek lunate epsilon symbol, U+03F5), written as \epsilon in LaTeX math mode.

https://texform.dev/latex/symbols/epsilon

## Metadata

| Field | Value |
| --- | --- |
| Topic | [Greek letters](https://texform.dev/latex/topics/greek) |
| Packages | base |
| Allowed mode | math |
| Glyph | ϵ |
| Unicode | U+03F5 GREEK LUNATE EPSILON SYMBOL |
| Delimiter | No |

## Syntax

```latex
\epsilon
```

Takes no arguments.

## Common tasks

### How to write a Greek epsilon

```latex
\epsilon
```

[Open in Playground](https://play.texform.dev/?input=%5Cepsilon)

### How to write an epsilon-delta limit

```latex
0<|x-a|<\delta \implies |f(x)-L|<\epsilon
```

[Open in Playground](https://play.texform.dev/?input=0%3C%7Cx-a%7C%3C%5Cdelta+%5Cimplies+%7Cf%28x%29-L%7C%3C%5Cepsilon)

### How to choose the lunate epsilon instead

\epsilon and \varepsilon are different glyphs; pick one and stay consistent.

```latex
\varepsilon
```

[Open in Playground](https://play.texform.dev/?input=%5Cvarepsilon)

## Usage frequency

3.95% of formulas in the measured corpus contain this entry, rank 30 of 474 entries with frequency data.

## In TeXForm

TeXForm parses this entry as a character leaf mapped to U+03F5 (GREEK LUNATE EPSILON SYMBOL).