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An example of a minimal action of the free semi-group $\F^{+}_{2}$ on the Hilbert space by Grivaux, Sophie; Roginskaya, Maria is a scholarly article available to read on EtoBox.

What is An example of a minimal action of the free semi-group $\F^{+}_{2}$ on the Hilbert space about?

The Invariant Subset Problem on the Hilbert space is to know whether there exists a bounded linear operator $T$ on a separable infinite-dimensional Hilbert space $H$ such that the orbit $\{T^{n}x;\ n\ge 0\}$ of every non-zero vector $x\in H$ under the action of $T$ is dense in $H$. We show that there exists a bounded linear operator $T$ on a complex separable infinite-dimensional Hilbert space $H$ and a unitary operator $V$ on $H$, such that the following property holds true: for every non-zero vector $x\in H$, either $x$ or $Vx$ has a dense orbit under the action of $T$. As a consequence, we obtain in particular that there exists a minimal action of the free semi-group with two generators $\F^{+}_{2}$ on a complex separable infinite-dimensional Hilbert space $H$.

Author

Grivaux, Sophie; Roginskaya, Maria

Published

2013

Language

EN