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    The disjunctive conclusion 'at least one inclusion is pro... — Carmelics
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    Challenges→At least one of the inclusions L ⊆ NL, NL ⊆ P, P ⊆ NP, NP ⊆ PSPACE must be proper

    The disjunctive conclusion 'at least one inclusion is proper' is a theorem of classical logic applied to set-theoretic containment, but its epistemic status depends on whether mathematical existence is constructively or platonistically interpreted.

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    Key Terms

    Constructively interpreted(in philosophy of mathematics)
    A way of thinking about mathematics where something only counts as existing if we can actually build it or show how to create it step-by-step. No abstract ideas allowed without proof.
    Disjunctive conclusion(in logic and reasoning)
    A conclusion that presents at least two possible options, usually phrased as 'either A or B' (or both). In logic, you're saying that at least one of these possibilities must be true.
    Epistemic status(in epistemology (the study of knowledge))
    How certain or justified we are in believing something is true. It's asking: 'Do we really know this, or are we just guessing?'
    Mathematical existence(in philosophy of mathematics)
    Whether mathematical objects (like numbers or sets) actually exist as real things or are just useful ideas we invented to solve problems.

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    Platonically interpreted(in philosophy of mathematics)
    A way of thinking about mathematics where numbers, sets, and abstract ideas exist in their own special realm, independent of whether humans can build them or use them. Named after the ancient philosopher Plato.
    Proper inclusion(in set theory and mathematics)
    When one set is completely contained inside another set, but they are not the same set. For example, all apples are in the fruit category, but apples are not the same as all fruits.
    Set-theoretic containment(in mathematics)
    The mathematical concept of whether one collection of things (a set) is completely inside another collection. For example, checking if all red cars are contained in the set of all cars.
    Theorem
    A theorem is a statement that has been proven to be true through logical reasoning and evidence. It's a fact that mathematicians or scientists have carefully verified using step-by-step arguments, starting from things already known to be true. Once proven, theorems become reliable building blocks that others can use to prove even more complex ideas.
    classical logic(Contrasted with Hegel's dialectical approach that accepts contradictions)
    Aristotelian logic that dominated during Hegel's lifetime

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    At least one of the inclusions L ⊆ NL, NL ⊆ P, P ⊆ NP, NP ⊆ PSPACE must be prope...

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