As summarized in Table 12 , SNES includes several Newton-like nonlinear solvers based on line search techniques and trust region methods. The methods for solving systems of nonlinear equations and unconstrained minimization problems employ the prefixes SNES_EQ and SNES_UM, respectively.
Each solver may have associated with it a set of options, which can be set with routines and options database commands provided for this purpose. A complete list can be found by consulting the manual pages or by running a program with the -help option; we discuss just a few in the sections below.