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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. Isotopy of an algebra - Wikipedia

    en.wikipedia.org/wiki/Isotopy_of_an_algebra

    In mathematics, an isotopy from a possibly non-associative algebra A to another is a triple of bijective linear maps (a, b, c) such that if xy = z then a(x)b(y) = c(z).This is similar to the definition of an isotopy of loops, except that it must also preserve the linear structure of the algebra.

  4. 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.

  5. 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.

  6. Field norm - Wikipedia

    en.wikipedia.org/wiki/Field_norm

    One of the basic examples of norms comes from quadratic field extensions () / where is a square-free integer.. Then, the multiplication map by on an element + is (+) = +.The element + can be represented by the vector

  7. Quaternion algebra - Wikipedia

    en.wikipedia.org/wiki/Quaternion_algebra

    In mathematics, a quaternion algebra over a field F is a central simple algebra A over F [1] [2] that has dimension 4 over F.Every quaternion algebra becomes a matrix algebra by extending scalars (equivalently, tensoring with a field extension), i.e. for a suitable field extension K of F, is isomorphic to the 2 × 2 matrix algebra over K.

  8. Field trace - Wikipedia

    en.wikipedia.org/wiki/Field_trace

    The trace form for a finite degree field extension L/K has non-negative signature for any field ordering of K. [8] The converse, that every Witt equivalence class with non-negative signature contains a trace form, is true for algebraic number fields K. [8] If L/K is an inseparable extension, then the trace form is identically 0. [9]

  9. Compact group - Wikipedia

    en.wikipedia.org/wiki/Compact_group

    The circle of center 0 and radius 1 in the complex plane is a compact Lie group with complex multiplication.. In mathematics, a compact (topological) group is a topological group whose topology realizes it as a compact topological space (when an element of the group is operated on, the result is also within the group).

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