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  2. Near-field (mathematics) - Wikipedia

    en.wikipedia.org/wiki/Near-field_(mathematics)

    The case = is the case of commutative finite fields; the nine element example above is =, =. In the seven exceptional examples, A {\displaystyle A} is of the form C p 2 {\displaystyle C_{p}^{2}} . This table, including the numbering by Roman numerals, is taken from Zassenhaus's paper.

  3. Glossary of field theory - Wikipedia

    en.wikipedia.org/wiki/Glossary_of_field_theory

    It consists of all the elements of E that can be obtained by repeatedly using the operations +, −, *, / on the elements of F and S. If E = F(S), we say that E is generated by S over F. Primitive element An element α of an extension field E over a field F is called a primitive element if E=F(α), the smallest extension field containing α.

  4. Burnside problem - Wikipedia

    en.wikipedia.org/wiki/Burnside_problem

    For which positive integers m, n is the free Burnside group B(m, n) finite? The full solution to Burnside problem in this form is not known. Burnside considered some easy cases in his original paper: B(1, n) is the cyclic group of order n. B(m, 2) is the direct product of m copies of the cyclic group of order 2 and hence finite. [note 1]

  5. 9 - Wikipedia

    en.wikipedia.org/wiki/9

    Nine is the number of derangements of 4, or the number of permutations of four elements with no fixed points. [8] 9 is the fourth refactorable number, as it has exactly three positive divisors, and 3 is one of them. [9] A number that is 4 or 5 modulo 9 cannot be represented as the sum of three cubes. [10]

  6. Field trace - Wikipedia

    en.wikipedia.org/wiki/Field_trace

    If L/K is separable then each root appears only once [2] (however this does not mean the coefficient above is one; for example if α is the identity element 1 of K then the trace is [L:K ] times 1). More particularly, if L/K is a Galois extension and α is in L, then the trace of α is the sum of all the Galois conjugates of α, [1] i.e.,

  7. Snake lemma - Wikipedia

    en.wikipedia.org/wiki/Snake_lemma

    The snake lemma is a tool used in mathematics, particularly homological algebra, to construct long exact sequences.The snake lemma is valid in every abelian category and is a crucial tool in homological algebra and its applications, for instance in algebraic topology.

  8. Category of sets - Wikipedia

    en.wikipedia.org/wiki/Category_of_sets

    Assuming this extra axiom, one can limit the objects of Set to the elements of a particular universe. (There is no "set of all sets" within the model, but one can still reason about the class U of all inner sets, i.e., elements of U.) In one variation of this scheme, the class of sets is the union of the entire tower of Grothendieck universes.

  9. Finite ring - Wikipedia

    en.wikipedia.org/wiki/Finite_ring

    In mathematics, more specifically abstract algebra, a finite ring is a ring that has a finite number of elements. Every finite field is an example of a finite ring, and the additive part of every finite ring is an example of an abelian finite group, but the concept of finite rings in their own right has a more recent history.

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