1# Linear Solvers and Krylov Methods (KSP) 2 3The `KSP` class provides an easy-to-use interface to the combination of 4a Krylov subspace iterative method and a preconditioner `PC` for the solution of linear systems and some least squares problems. See 5`PETSCREGRESSORLINEAR` for additional regression (least squares) solvers. 6 7 8<A HREF="PETSC_DOC_OUT_ROOT_PLACEHOLDER/src/ksp/ksp/tutorials/index.html">Examples</A><BR> 9 10