# 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
bddc.c
bddcfetidp.c
bddcgraph.c
bddcnullspace.c
bddcprivate.c
bddcscalingbasic.c
bddcschurs.c