# Linear Solvers and Krylov Methods (KSP)
The `KSP` class provides an easy-to-use interface to the combination of
a Krylov subspace iterative method and a preconditioner `PC`.
Examples
sr1/
dfp/
bfgs/
symbrdn/
brdn/
diagbrdn/
lmvm.h
lmvmimpl.c
lmvmutils.c