References
- V. A. Baskakov, Some convergence conditions for positive linear operators, Uspehi Mat. Nauk., 16 (1961) 131–135 (Russian).
- H. Bauer, Šilovscher Rand und Dirichletsches Problem, Ann. Inst. Fourier, 11 (1961) 89–136.
- H. Bauer, Theorems of Korovkin type for adapted spaces, Ann. Inst. Fourier, 23, 4 (1973) 245–260.
- H. Bauer, Convergence of monotone operators, Math. Z., 136 (1974) 315–330.
- H. Bauer, Approximationssätze und abstrakte Ränder, Math.-Phys. Semesterber., 23 (1976) 141–173.
- H. Bauer, Probability Theory and Elements of Measure Theory, Holt, Rinehart and Winston, New York, 1972.
- H. Berens and G. G. Lorentz, Theorems of Korovkin type for positive linear operators on Banach lattices, Approximation Theory (Ed. G. G. Lorentz), Academic Press, New York, 1973.
- S. Bernstein, Demonstration du théorème de Weierstrass fondée sur le calcul des probabilités. Comm. Soc. Math. Kharkow, (2) 13 (1912) 1–2.
- G. Choquet, Lectures on Analysis, Vol. II, Representation Theory, Benjamin, New York, 1969.
- K. Donner, Korovkin theorems for positive linear operators, J. Approximation Theory, 13 (1975) 443–450.
- K. Donner, Korovkin theorems and P-essential sets, to appear in J. Approximation Theory.
- M. W. Grossman, Korovkin theorems for adapted spaces with respect to a positive operator, Math. Ann., 220 (1976) 253–262.
- E. Hewitt and K. Stromberg, Real and Abstract Analysis, Springer-Verlag, New York, 1965.
- K. Jacobs, Extremalpunkte konvexer Mengen, Selecta Mathematica Ill, Springer-Verlag, New York, 1971.
- P. P. Korovkin, On convergence of linear positive operators in the space of continuous functions, Dokl. Akad. Nauk SSSR (N.S.), 90 (1953) 961–964 (Russian).
- P. P. Korovkin, Linear Operators and Approximation Theory, Hindustan Publ. Corp., Delhi, India, 1960.
- S. S. Kutateladze, Choquet boundaries in K-spaces, Uspehi Mat. Nauk., 30 (1975) 107–146 (Russian). Translated in: Russian Math. Surveys, 30 (1975) 115–155.
- G. Leha, Relative Korovkin-Sätze und Ränder, Math. Ann., 229 (1977) 87–95 and 233 (1978) 273–274.
- R. R. Phelps, Lectures on Choquet's Theorem, Van Nostrand Math. Studies, 7, 1966.
- Yu. A. Šaškin, Korovkin systems in spaces of continuous functions, Izv. Akad. Nauk SSSR, Ser. Mat., 26 (1962) 495–512 (Russian). Translated in: Amer. Math. Soc. Transl., Ser. 2, 54 (1966) 125–144.
- Yu. A. Šaškin, On the convergence of contractive operators, Mathematica (Cluj), 11 (34) (1969) 355–360 (Russian).
- Yu. A. Šaškin, On the convergence of linear operators, Konf. Konstruktiv. Teor. Funkcii, Varna 1970 (1972) 119–125 (Russian).
- Yu. A. Šaškin, Abstract harmonic functions and the problem of operator convergence. Mathematica (Cluj), 15 (38) (1973) 143–148 (Russian).
- F. A. Valentine, Convex Sets, McGraw-Hill, New York, 1964.
- M. Wolff, Uber die Korovkinhülle von Teilmengen in lokalkonvexen Vektorverbänden, Math. Ann., 213 (1975) 97–108.
- M. Wolff, On Korovkin-type theorems in special function lattices, J. Approximation Theory (to appear).
- D. E. Wulbert, Convergence of operators and Korovkin's theorem, J. Approximation Theory, 1 (1968) 381–390.