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    Diaconescu's theorem shows Choice can be derived from see... — Carmelics
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    Challenges→The restricted principle that all well-founded sets are well-orderable is consistent with this theory

    Diaconescu's theorem shows Choice can be derived from seemingly innocuous structural assumptions, meaning the supporting argument may smuggle in Choice rather than isolate well-foundedness as the operative factor.

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    Key Terms

    Axiom of Choice(Foundations of mathematics; arises in second-order logic as the statement that every total binary relation has a choice function)
    Given a set A of non-empty pairwise disjoint sets, there exists a set B containing exactly one element from each set in A. When A is infinite, forming B requires making infinitely many simultaneous choices.
    Diaconescu's theorem(as used in logic and mathematics)
    A mathematical proof discovered by Romanian logician Radu Diaconescu showing that a certain logical principle (the Axiom of Choice) can be proven true using other basic assumptions, even though those assumptions seem unrelated to it.
    Smuggle in (philosophical usage)(as used in logic and philosophy)
    To sneak in an assumption or conclusion that isn't obviously there, so that an argument appears simpler or more neutral than it actually is.
    Structural assumptions(as used in logic and philosophy)

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    Basic rules or principles about how a logical system is organized, which seem simple and non-controversial on their own.
    well-foundedness(Ordinal analysis of formal theories)
    A property of a relation ≺ that refers to arbitrary sequences, stronger than accessibility

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    Truth & Knowledge1 linkedModality & Possibility1 linked

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    The restricted principle that all well-founded sets are well-orderable is consis...

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