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  2. C0-semigroup - Wikipedia

    en.wikipedia.org/wiki/C0-semigroup

    Any classical solution is a mild solution. A mild solution is a classical solution if and only if it is continuously differentiable. [6] The following theorem connects abstract Cauchy problems and strongly continuous semigroups. Theorem: [7] Let A be a closed operator on a Banach space X. The following assertions are equivalent:

  3. List of unsolved problems in statistics - Wikipedia

    en.wikipedia.org/wiki/List_of_unsolved_problems...

    Though there are many approximate solutions (such as Welch's t-test), the problem continues to attract attention [4] as one of the classic problems in statistics. Multiple comparisons: There are various ways to adjust p-values to compensate for the simultaneous or sequential testing of hypotheses. Of particular interest is how to simultaneously ...

  4. Category:Theorems in statistics - Wikipedia

    en.wikipedia.org/.../Category:Theorems_in_statistics

    Central limit theorem; Characterization of probability distributions; Cochran's theorem; Complete class theorem; Continuous mapping theorem; Cox's theorem; Cramér's decomposition theorem; Craps principle

  5. List of incomplete proofs - Wikipedia

    en.wikipedia.org/wiki/List_of_incomplete_proofs

    The four-color theorem was eventually proved by Kenneth Appel and Wolfgang Haken in 1976. [2] Schröder–Bernstein theorem. In 1896 Schröder published a proof sketch [3] which, however, was shown to be faulty by Alwin Reinhold Korselt in 1911 [4] (confirmed by Schröder). [5] [6] Jordan curve theorem. There has been some controversy about ...

  6. List of theorems - Wikipedia

    en.wikipedia.org/wiki/List_of_theorems

    This is a list of notable theorems.Lists of theorems and similar statements include: List of algebras; List of algorithms; List of axioms; List of conjectures

  7. No free lunch in search and optimization - Wikipedia

    en.wikipedia.org/wiki/No_free_lunch_in_search...

    In computational complexity and optimization the no free lunch theorem is a result that states that for certain types of mathematical problems, the computational cost of finding a solution, averaged over all problems in the class, is the same for any solution method.

  8. Density functional theory - Wikipedia

    en.wikipedia.org/wiki/Density_functional_theory

    The first HK theorem demonstrates that the ground-state properties of a many-electron system are uniquely determined by an electron density that depends on only three spatial coordinates. It set down the groundwork for reducing the many-body problem of N electrons with 3 N spatial coordinates to three spatial coordinates, through the use of ...

  9. Reference class problem - Wikipedia

    en.wikipedia.org/wiki/Reference_class_problem

    In statistics, the reference class problem is the problem of deciding what class to use when calculating the probability applicable to a particular case.. For example, to estimate the probability of an aircraft crashing, we could refer to the frequency of crashes among various different sets of aircraft: all aircraft, this make of aircraft, aircraft flown by this company in the last ten years ...