Some Results on Generalized Frames

Javad Baradaran, Zahra Ghorbani

Abstract



The concept of a generalized frame or simply a $g$-frame in a Hilbert space $H$ was introduced by Wenchang Sun in [4]. Given a $g$-frame $\{\Lambda_i\}_{i \in I}$ in a Hilbert space $H$ and a bounded operator $T$ on $H$, we show that the sequence $\{\Lambda_{i}T\}_{i \in I}$ is a $g$-frame for $H$ if and only if $T$ is invertiable on $H$. Moreover, we prove that add a $g$-frame to its canonical dual $g$-frame and the canonical Parseval $g$-frame are also $g$-frames. At the end, we provide sufficient conditions under which a subsequence of a $g$-frame in a Hilbert space $H$ is itself a $g$-frame for $H$.

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The Thai Journal of Mathematics is supported by The Mathematical Association of Thailand and Thailand Research Council and the Center for Promotion of Mathematical Research of Thailand (CEPMART).

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|ISSN 1686-0209|