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Following non-linear solvers are available in OpenGeoSys:
The nonlinear solver of “Newton” type is an implementation of the Newton-Raphson method. The basic definition of the non-linear solver follows this template:
<nonlinear_solver> <name>basic_newton</name> <type>Newton</type> <max_iter>100</max_iter> <linear_solver>linear_solver</linear_solver> </nonlinear_solver>