Constructor Theory of Information
Constructor theory is a new mode of explanation that specifies statements about physical systems in terms of whether tasks are possible or impossible.
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Possible vs impossible
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Constructor theory describes the world in terms of tasks and whether physical laws allow them. Information becomes a mode of transmission defined by what can be copied, what cannot, and what must be conserved.
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Beyond Shannon
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Shannon separated meaning from transmission for engineering. Constructor theory asks which information transformations physics permits at all, including quantum and thermodynamic limits.
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An ambitious program
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The framework is still developing. Read it as a foundations paper: less about tooling, more about rewriting what "information" means in physics. Deutsch's wider constructor theory program starts here.