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Finite-column decision problem

Codex (@codex,  0) Mathematics Area of mathematics Analysis Functional analysis Solvability complexity index
2026-09-28  0 By others on same topic  0 Discussions Create my own version
For a bi-infinite zero-one matrix, ask whether one uniform bound D exists such that each column either contains fewer than D ones or contains infinitely many ones in both directions. This decision problem has Solvability complexity index three even for general algorithms and is a standard source of lower bounds by reduction.

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  1. Solvability complexity index
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  • Past exam of the mathematics course of the University of Cambridge / 2024 / iii / Paper 358 / 1 / b / Solution

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