1: #pragma once 2: PETSC_INTERN PetscErrorCode TSARKIMEXSetFastSlowSplit_ARKIMEX(TS, PetscBool); 3: PETSC_INTERN PetscErrorCode TSARKIMEXGetFastSlowSplit_ARKIMEX(TS, PetscBool *); 4: PETSC_INTERN PetscErrorCode TSHasRHSFunction(TS, PetscBool *);