English

Spatial-Temporal Differentiation Theorems

Dynamical Systems 2022-05-20 v5

Abstract

Let (X,B,μ,T)(X, \mathcal{B}, \mu, T) be a dynamical system where XX is a compact metric space with Borel σ\sigma-algebra B\mathcal{B}, and μ\mu is a probability measure that's ergodic with respect to the homeomorphism T:XXT : X \to X. We study the following differentiation problem: Given fC(X)f \in C(X) and FkBF_k \in \mathcal{B}, where μ(Fk)>0\mu(F_k) > 0 and μ(Fk)0\mu(F_k) \to 0, when can we say that limkFk(1ki=0k1Tif)dμμ(Fk)=fdμ?\lim_{k \to \infty} \frac{\int_{F_k} \left( \frac{1}{k} \sum_{i = 0}^{k - 1} T^i f \right) \mathrm{d} \mu}{\mu(F_k)} = \int f \mathrm{d} \mu ?

Keywords

Cite

@article{arxiv.2101.06473,
  title  = {Spatial-Temporal Differentiation Theorems},
  author = {Idris Assani and Aidan Young},
  journal= {arXiv preprint arXiv:2101.06473},
  year   = {2022}
}

Comments

Changes were made taking into account a referee's comments