The paper investigates 2-frames and 2-Riesz bases, revealing connections and characterizations within Hilbert spaces.
This paper addresses 2-frames and 2-Riesz bases based on a 2-inner product induced by a Hilbert space inner product. We establish some links among frames, Riesz bases, 2-frames and 2-Riesz bases; and investigate the existence and characterizations of 2-Riesz bases.
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Li et al. (2026) studied this question.
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