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Published online by Cambridge University Press: 20 November 2018
The following theorem is a widely used corollary of the Thorn-Riesz convexity theorem ([1], pp. 526).
Theorem. Let (Ω, a, μ) be a positive measure space, and let
be a linear operator with ‖T‖1≤1, ‖T‖∞≤1. Then ‖T‖p≤1, 1≤p≤∞