1*46696af2SBarry Smith# Nonlinear Solvers (SNES) 2*46696af2SBarry Smith 3*46696af2SBarry SmithThe Scalable Nonlinear Equations Solvers (`SNES`) component provides an 4*46696af2SBarry Smitheasy-to-use interface to Newton-type, quasi-Newton, full approximation scheme (FAS) multigrid, and other methods for solving systems of 5*46696af2SBarry Smithnonlinear equations. User guide chapter: [](ch_snes). 6*46696af2SBarry Smith 7*46696af2SBarry Smith`SNES` internally employs `KSP` for the solution of its linear systems. `SNES` users can also set `KSP` options directly in application 8*46696af2SBarry Smithcodes by first extracting the `KSP` context from the `SNES` context via `SNESGetKSP()` 9*46696af2SBarry Smithand then directly calling various `KSP` (and `PC`) routines, 10*46696af2SBarry Smith 11*46696af2SBarry Smith<A HREF="PETSC_DOC_OUT_ROOT_PLACEHOLDER/src/snes/tutorials/index.html">Examples</A><BR> 12*46696af2SBarry Smith 13