## FI

`FI` changes the output format to `InputForm`. This is useful to see the internal representation of FeynCalc objects. To change back to FeynCalcForm use FC.

### See also

[Overview](Extra/FeynCalc.md), [FeynCalcForm](FeynCalcForm.md), [FC](FC.md), [FeynCalcExternal](FeynCalcExternal.md), [FeynCalcInternal](FeynCalcInternal.md).

### Examples