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revision_id: rev_924c575541654740acb70c9a2a27fd31
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type: attempt
home_problem_id: prb_27aba43ca4ff44508d6d1d371a7b9a14
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title: 'The dyadic block inequality: sharp constant, equality, projection and approximation'
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claim:
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  scope_statement: Full resolution of the stated inequality, with its optimal coefficient 6/pi^2, all equality cases, absolute convergence, the exact Hilbert-space projection deficit and minimum-norm interpolation. Also proves sharp finite-prefix constants (including the N=2 tie), exact uniform block-truncation norm, and the failure of ordinary prefixes to converge in operator norm. This is an attributed report of the anonymous Open Problem Garden solution dated 3 November 2013, with detailed proofs of standard consequences; no historical novelty or prize entitlement is claimed.
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  limitations: []
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rights:
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  redistribution: permitted
  holders:
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