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Abstract: Let $T$ be a $C 0$-contraction on a separable Hilbert space.
We assume that$I H-T^*T$ is compact.
For a function $f$ holomorphic in the unit disk $\DD$and continuous on $\bar\DD$, we show that $fT$ is compact if and only if $f$vanishes on $\sigma T\cap \TT$, where $\sigma T$ is the spectrum of $T$ and$\TT$ the unit circle.
If $f$ is just a bounded holomorphic function on $\DD$we prove that $fT$ is compact if and only if $\lim {n\to \infty} T^nfT =0$.



Autor: Karim Kellay LATP, Mohamed Zarrabi IMB

Fuente: https://arxiv.org/



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