The source code. They are in for example src/ksp/ksp/impls/cg/cg.c  
Or all pretty
at 
http://www.mcs.anl.gov/petsc/petsc-as/snapshots/petsc-current/src/ksp/ksp/impls/cg/cg.c.html#KSPCG


   Barry

On Jan 30, 2009, at 4:10 PM, Yixun Liu wrote:

> Hi,
> Where can I find the details about the implementation of KSP solver  
> such
> as CG in PETSC?
>
> Thanks.
>
> Yixun

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