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Bemerkungen zur Approximationsgüte bei projektiven Verfahren. (German) Zbl 0183.42002


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[1] Agmon, S.: Lectures on elliptic boundary value problems. Princeton-Toronto-New York-London: D. Van Nostrand 1965. · Zbl 0142.37401
[2] Daugavet, I. K.: A remark on the rapidity of convergence of the Ritz method [Russisch]. Vestnik Leningrad Univ.21, 145-147 (1966).
[3] Golomb, M.: Optimal approximating manifolds inL 2-spaces. J. of Math. Anal. and Appl.12, 505-512 (1965). · Zbl 0143.16304 · doi:10.1016/0022-247X(65)90019-3
[4] Nitsche, J.: Zur Konvergenzgeschwindigkeit des Ritzschen Verfahrens und der Fehlerquadrat-methode II. Erscheint demnächst in Z. angew. Math. Mech.
[5] Shapiro, H. S.: Some negative theorems of approximation theory. The Michigan Math. Journal11, 211-217 (1964). · Zbl 0123.09202 · doi:10.1307/mmj/1028999132
[6] Yosida, K.: Functional analysis. Berlin-Göttingen-Heidelberg: Springer 1965. · Zbl 0126.11504
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