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  2. Second-order logic - Wikipedia

    en.wikipedia.org/wiki/Second-order_logic

    A (existential second-order) formula is one additionally having some existential quantifiers over second order variables, i.e. …, where is a first-order formula. The fragment of second-order logic consisting only of existential second-order formulas is called existential second-order logic and abbreviated as ESO, as , or even as ∃SO.

  3. Monadic second-order logic - Wikipedia

    en.wikipedia.org/wiki/Monadic_second-order_logic

    In mathematical logic, monadic second-order logic (MSO) is the fragment of second-order logic where the second-order quantification is limited to quantification over sets. [1] It is particularly important in the logic of graphs , because of Courcelle's theorem , which provides algorithms for evaluating monadic second-order formulas over graphs ...

  4. Second-order arithmetic - Wikipedia

    en.wikipedia.org/wiki/Second-order_arithmetic

    The system Π 1 1-comprehension is the system consisting of the basic axioms, plus the ordinary second-order induction axiom and the comprehension axiom for every (boldface [11]) Π 1 1 formula φ. This is equivalent to Σ 1 1 -comprehension (on the other hand, Δ 1 1 -comprehension, defined analogously to Δ 0 1 -comprehension, is weaker).

  5. Logic of graphs - Wikipedia

    en.wikipedia.org/wiki/Logic_of_graphs

    In the monadic second-order logic of graphs, the variables represent objects of up to four types: vertices, edges, sets of vertices, and sets of edges. There are two main variations of monadic second-order graph logic: MSO 1 in which only vertex and vertex set variables are allowed, and MSO 2 in which all four types of variables are allowed ...

  6. True quantified Boolean formula - Wikipedia

    en.wikipedia.org/.../True_quantified_boolean_formula

    In computational complexity theory, the language TQBF is a formal language consisting of the true quantified Boolean formulas.A (fully) quantified Boolean formula is a formula in quantified propositional logic (also known as Second-order propositional logic) where every variable is quantified (or bound), using either existential or universal quantifiers, at the beginning of the sentence.

  7. Fagin's theorem - Wikipedia

    en.wikipedia.org/wiki/Fagin's_theorem

    In addition to Fagin's 1974 paper, [1] the 1999 textbook by Immerman provides a detailed proof of the theorem. [4] It is straightforward to show that every existential second-order formula can be recognized in NP, by nondeterministically choosing the value of all existentially-qualified variables, so the main part of the proof is to show that every language in NP can be described by an ...

  8. Second-order propositional logic - Wikipedia

    en.wikipedia.org/wiki/Second-order_propositional...

    A second-order propositional logic is a propositional logic extended with quantification over propositions. A special case are the logics that allow second-order Boolean propositions , where quantifiers may range either just over the Boolean truth values , or over the Boolean-valued truth functions .

  9. Hume's principle - Wikipedia

    en.wikipedia.org/wiki/Hume's_principle

    (I. III. I.) [2] Note Hume's use of the word number in the ancient sense, to mean a set or collection of things rather than the common modern notion of "positive integer". The ancient Greek notion of number (arithmos) is of a finite plurality composed of units. See Aristotle, Metaphysics, 1020a14 and Euclid, Elements, Book VII, Definition 1 and ...

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