## A00

`A00[m^2]` is the Passarino-Veltman coefficient function $A_{00}$, i.e. the coefficient function multiplying $g^{\mu \nu}$. The argument  is a scalar and has mass dimension 2.

### See also

[Overview](Extra/FeynCalc.md), [A0](A0.md), [B0](B0.md), [C0](C0.md), [D0](D0.md), [PaVe](PaVe.md).

### Examples

$A_{00}$ get automatically reduced to $A_0$

```mathematica
A00[m^2]
```

$$\frac{m^2 \;\text{A}_0\left(m^2\right)}{D}$$

According to the rules of dimensional regularization $A_{00}(0)$ is set to 0.

```mathematica
A00[0]
```

$$0$$