Summary
Many difference methods for the numerical solution of elliptic boundary value problems lead to systems of linear equations whose matrices areM-matrices and which therefore have nonnegative inverses. In this paper it is shown, that these difference methods are at most consistent of second order.
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Yserentant, H. Die maximale Konsistenzordnung von Differenzenapproximationen nichtnegativer Art. Numer. Math. 42, 119–123 (1983). https://doi.org/10.1007/BF01400922
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DOI: https://doi.org/10.1007/BF01400922