Conjecture on weighted frame representations of invertible unconditionally convergent multipliers
Let be a Hilbert space, let and be sequences in , and let be a complex sequence. The multiplier is given by
It is unconditionally convergent if this series converges unconditionally for every . A sequence in is a frame for if it satisfies the frame inequalities, and a multiplier is invertible when it is an invertible bounded operator on . Weighted frame representation conjecture. Let be an unconditionally convergent multiplier which is invertible on . Then there exist and such that and are frames for and
for all . This asks whether every invertible unconditionally convergent multiplier admits a representation using weighted versions of its two defining sequences that are both frames; the context states that this question was posed as a conjecture, while its general status is not otherwise resolved here.
References
Primary source
Peter Balazs, Rosario Corso and Diana Stoeva, “Weighted frames, weighted lower semi frames and unconditionally convergent multipliers”, arXiv:2310.18957 (2023).
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