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ex1.c: Tests solving linear system on 0 by 0 matrix
ex2.c: Demonstrates running several independent tasks in PETSc
ex3.c: This example solves a linear system in parallel with KSP
ex4.c: Solves a linear system with KSP
ex6.c: Reads a PETSc matrix and vector from a file and solves a linear system
ex7.c: Reads a PETSc matrix and vector from a file and solves a linear system
ex10.c: This example calculates the stiffness matrix for a brick in three\n\
ex14.c: Solves a nonlinear system in parallel with a user-defined Newton method
ex15.c: KSP on an operator with a null space
ex17.c: Solves a linear system with KSP
ex18.c: Reads a PETSc matrix and vector from a file and solves a linear system
ex19.c: Solvers Laplacian with multigrid, bad way
ex20.c: This example solves a linear system in parallel with KSP
ex24.c: Tests CG, MINRES and SYMMLQ on symmetric matrices with SBAIJ format
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