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It is shown that the Ritz projection onto spaces of piecewise linear finite elements is bounded in the Sobolev space, $\overset {\circ} {W}_p^1$, for $2 \leqslant p \leqslant \infty$.
Econometrica, Vol. 35, No. 3/4 (Jul. - Oct., 1967), pp. 447-471 (25 pages) ...
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