Some universality results for dynamical systems

We prove some "universality" results for topological dynamical systems. In particular, we show that for any continuous self-map $T$ of a perfect Polish space, one can find a dense, $T$-invariant set homeomorphic to the Baire space ${\mathbb N}^{\mathbb N}$; that there exists a bounded linear operator $U: \ell_1 \rightarrow \ell_1$ such that any linear operator $T$ from a separable Banach space into itself with $\Vert T\Vert\leq 1$ is a linear factor of $U$; and that given any $σ$-compact family ${\mathcal F}$ of continuous self-maps of a compact metric space, there is a continuous self-map $U_{\mathcal F}$ of ${\mathbb N}^{\mathbb N}$ such that each $T\in {\mathcal F}$ is a factor of $U_{\mathcal F}$.

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