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IFEM: Bottom Line

nIf you can do matrix-vector product, you can run iterative solvers like conjugate gradient

nMatrix-vector product amounts to the
usual FEM calculation (displacements to
forces), plus the usual FEM communication
(update shared nodes)

nYou don’t even need to store the matrix

nUsers can easily solve iterative problems
with the FEM framework and IFEM
solvers!