In this note we derive a theorem about the common fixed point set of commuting nonexpansive mappings defined in Cartesian products of separable spaces. The proof is based on a method due to R. E. Bruck.
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We prove a sufficient condition for products of Toeplitz operators $T_fT_{ḡ}$, where f,g are square integrable holomorphic functions in the unit ball in ℂⁿ, to be bounded on the weighted Bergman space. This condition slightly improves the result obtained by K. Stroethoff and D. Zheng. The analogous condition for boundedness of products of Hankel operators $H_fH*_g$ is also given.
We give new characterizations of the analytic Besov spaces \(B_p\) on the unit ball \(\mathbb{B}\) of \(\mathbb{C}^n\) in terms of oscillations and integral means over some Euclidian balls contained in \(\mathbb{B}\).
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