## EpsilonIR

`EpsilonIR`  denotes $(D-4)$, where $D$ is the number of space-time dimensions.

`EpsilonIR` stands for a small negative number that explicitly regulates only IR divergences.

### See also

[Overview](Extra/FeynCalc.md), [Epsilon](Epsilon.md), [EpsilonUV](EpsilonUV.md).

### Examples

```mathematica
EpsilonIR
```

$$\varepsilon _{\text{IR}}$$