# PCApplyRichardsonExists
Determines whether a particular preconditioner has a built-in fast application of Richardson's method. 
## Synopsis
```
#include "petscksp.h" 
PetscErrorCode PCApplyRichardsonExists(PC pc, PetscBool *exists)
```
Not Collective


## Input Parameter

- ***pc -*** the preconditioner



## Output Parameter

- ***exists -*** `PETSC_TRUE` or `PETSC_FALSE`





## See Also
 `PC`, `PCRICHARDSON`, `PCApplyRichardson()`

## Level
developer

## Location
<A HREF="PETSC_DOC_OUT_ROOT_PLACEHOLDER/src/ksp/pc/interface/precon.c.html#PCApplyRichardsonExists">src/ksp/pc/interface/precon.c</A>


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[Edit on GitLab](https://gitlab.com/petsc/petsc/-/edit/release/src/ksp/pc/interface/precon.c)


[Index of all PC routines](index.md)  
[Table of Contents for all manual pages](/docs/manualpages/index.md)  
[Index of all manual pages](/docs/manualpages/singleindex.md)  
