Indeed the integrals in the sparse case aren’t so bad https://arxiv.org/abs/2310.06301. I don’t think the analogy to the Thompson problem is correct, it’s similar but qualitatively different (there is a large literature on tight frames that is arguably more relevant).
Indeed the integrals in the sparse case aren’t so bad https://arxiv.org/abs/2310.06301. I don’t think the analogy to the Thompson problem is correct, it’s similar but qualitatively different (there is a large literature on tight frames that is arguably more relevant).