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  2. List of PSPACE-complete problems - Wikipedia

    en.wikipedia.org/wiki/List_of_PSPACE-complete...

    Word problem for context-sensitive language [35] Intersection emptiness for an unbounded number of regular languages [32] Regular Expression Star-Freeness [36] Equivalence problem for regular expressions [21] Emptiness problem for regular expressions with intersection. [21] Equivalence problem for star-free regular expressions with squaring. [21]

  3. List of mathematical logic topics - Wikipedia

    en.wikipedia.org/wiki/List_of_mathematical_logic...

    Tarski's exponential function problem; Undecidable problem; Institutional model theory. Institution (computer science) Non-standard analysis. Non-standard calculus; Hyperinteger; Hyperreal number; Transfer principle; Overspill; Elementary Calculus: An Infinitesimal Approach; Criticism of non-standard analysis; Standard part function; Set theory ...

  4. Word problem (mathematics) - Wikipedia

    en.wikipedia.org/wiki/Word_problem_(mathematics)

    The word problem for an algebra is then to determine, given two expressions (words) involving the generators and operations, whether they represent the same element of the algebra modulo the identities. The word problems for groups and semigroups can be phrased as word problems for algebras. [1]

  5. List of undecidable problems - Wikipedia

    en.wikipedia.org/wiki/List_of_undecidable_problems

    Many, if not most, undecidable problems in mathematics can be posed as word problems: determining when two distinct strings of symbols (encoding some mathematical concept or object) represent the same object or not. For undecidability in axiomatic mathematics, see List of statements undecidable in ZFC.

  6. Word problem (mathematics education) - Wikipedia

    en.wikipedia.org/wiki/Word_problem_(mathematics...

    Word problem from the Līlāvatī (12th century), with its English translation and solution. In science education, a word problem is a mathematical exercise (such as in a textbook, worksheet, or exam) where significant background information on the problem is presented in ordinary language rather than in mathematical notation.

  7. P versus NP problem - Wikipedia

    en.wikipedia.org/wiki/P_versus_NP_problem

    For these problems, it is very easy to tell whether solutions exist, but thought to be very hard to tell how many. Many of these problems are #P-complete, and hence among the hardest problems in #P, since a polynomial time solution to any of them would allow a polynomial time solution to all other #P problems.

  8. EXPSPACE - Wikipedia

    en.wikipedia.org/wiki/EXPSPACE

    A decision problem is EXPSPACE-complete if it is in EXPSPACE, and every problem in EXPSPACE has a polynomial-time many-one reduction to it. In other words, there is a polynomial-time algorithm that transforms instances of one to instances of the other with the same answer. EXPSPACE-complete problems might be thought of as the hardest problems ...

  9. Dejean's theorem - Wikipedia

    en.wikipedia.org/wiki/Dejean's_theorem

    In 1972, Dejean investigated the problem of determining, for each possible alphabet size, the threshold between exponents for which there exists an infinite -power-free word, and the exponents for which no such word exists. The problem was solved for two-symbol alphabets by the Thue–Morse sequence, and Dejean solved it as well for three ...

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