Dear PETSc folks,

While searching literature on the preconditioner for contact/mesh tying
problem, I saw the paper by Dr. Adams "Algebraic multigrid methods for
constrained linear systems with applications to contact problems in solid
mechanics, NLAA, 2004". Given the promising aspects the paper has shown for
constrained linear system, I wonder if some code's also available in PETSc
for testing/further extension?

Thanks
Giang

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