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The convergence problem for a sequence of positive linear operators on unbounded sets, and theorems analogous to that of P. P. Korovkin. (English. Russian original) Zbl 0312.41013

Sov. Math., Dokl. 15, 1433-1436 (1974); translation from Dokl. Akad. Nauk SSSR 218, 1001-1004 (1974).

MSC:

41A35 Approximation by operators (in particular, by integral operators)
47A35 Ergodic theory of linear operators
47B60 Linear operators on ordered spaces
41A65 Abstract approximation theory (approximation in normed linear spaces and other abstract spaces)
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