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    Routley and Meyer's relevant logic tradition denies that ... — Carmelics
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    Supports→Fitch's knowability argument does not straightforwardly apply to paraconsistent logics

    Routley and Meyer's relevant logic tradition denies that □¬p entails ¬◇p when modal operators are interpreted through world-relative inconsistency-tolerant accessibility relations.

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    Key Terms

    Accessibility relations(in modal logic and epistemology)
    A formal way of mapping out which situations or possibilities an agent (like a person) can distinguish or imagine from their current position—basically, what they can 'see' or consider as real options.
    Routley and Meyer(as philosophers/logicians whose research is being cited)
    Two logicians (Richard Routley and Robert Meyer) who studied non-classical logic systems in the 1970s-80s and proved important theorems about how different logical systems work.
    World-relative inconsistency-tolerant(as a characteristic of how this logical system works)
    A system where different possible scenarios (worlds) can each have their own set of rules, and some of them can contain contradictions without breaking the logic entirely.
    entails(describes a logical relationship between statements)
    Logically forces or guarantees; if A entails B, then whenever A is true, B must also be true.

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    modal operators
    unary connectives
    relevant logic(Contrasted with classical monotonic logic where X ⊢ A implies X,Y ⊢ A for any Y)
    A logical system that restricts premise combination so that all premises must bear some relevance to the conclusion; adding irrelevant material does not preserve entailment
    ¬ (negation symbol)(used in formal logic notation)
    The ¬ symbol means 'not'—so ¬Q means 'not Q.'
    □ (box symbol)(logical notation in the formula)
    In provability logic, this symbol means 'it is provable that' or 'it can be proven that'—it's shorthand for a whole phrase.
    ◇ (diamond symbol)(modal logic (logic of possibility and necessity))
    In logic, this symbol means 'it is possible that' the thing following it could happen or be true.

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    2 topics

    Truth & Knowledge1 linkedModality & Possibility1 linked

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    Fitch's knowability argument does not straightforwardly apply to paraconsistent ...

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