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On a multi-parametric generalization of the uniform zero-two law in \(L^1\)-spaces. (English) Zbl 1331.47059

Summary: Following an idea of D. Ornstein and L. Sucheston [Ann. Math. Stat. 41, 1631–1639 (1970; Zbl 0284.60068)], S. R. Foguel [Isr. J. Math. 10, 275–280 (1971; Zbl 0229.60056)] proved the so-called uniform “zero-two” law: let \(T:L^1(X,\mathcal{F},\mu) \to L^1(X,\mathcal{F},\mu)\) be a positive contraction. If for some \(m\in\mathbb N\cup\{0\}\) one has \(\| T^{m+1}-T^m\|<2\), then \[ \lim_{n\to\infty}\| T^{n+1}-T^n\|=0. \] There are many papers devoted to generalizations of this law. In the present paper, we provide a multi-parametric generalization of the uniform zero-two law for \(L^1\)-contractions.

MSC:

47B65 Positive linear operators and order-bounded operators
47A13 Several-variable operator theory (spectral, Fredholm, etc.)
47A35 Ergodic theory of linear operators
17C65 Jordan structures on Banach spaces and algebras
46L70 Nonassociative selfadjoint operator algebras
46L52 Noncommutative function spaces
28D05 Measure-preserving transformations
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