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  2. Involution (mathematics) - Wikipedia

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

    In linear algebra, an involution is a linear operator T on a vector space, such that T 2 = I. Except for in characteristic 2, such operators are diagonalizable for a given basis with just 1 s and −1 s on the diagonal of the corresponding matrix. If the operator is orthogonal (an orthogonal involution), it is orthonormally diagonalizable.

  3. Dagger category - Wikipedia

    en.wikipedia.org/wiki/Dagger_category

    In a dagger category , a morphism is called . unitary if † =,; self-adjoint if † =.; The latter is only possible for an endomorphism:.The terms unitary and self-adjoint in the previous definition are taken from the category of Hilbert spaces, where the morphisms satisfying those properties are then unitary and self-adjoint in the usual sense.

  4. *-algebra - Wikipedia

    en.wikipedia.org/wiki/*-algebra

    A *-algebra A is a *-ring, [b] with involution * that is an associative algebra over a commutative *-ring R with involution ′, such that (r x)* = r ′ x* ∀r ∈ R, x ∈ A. [3] The base *-ring R is often the complex numbers (with ′ acting as complex conjugation). It follows from the axioms that * on A is conjugate-linear in R, meaning

  5. C*-algebra - Wikipedia

    en.wikipedia.org/wiki/C*-algebra

    In mathematics, specifically in functional analysis, a C ∗-algebra (pronounced "C-star") is a Banach algebra together with an involution satisfying the properties of the adjoint. A particular case is that of a complex algebra A of continuous linear operators on a complex Hilbert space with two additional properties:

  6. Involutory matrix - Wikipedia

    en.wikipedia.org/wiki/Involutory_matrix

    An involution is non-defective, and each eigenvalue equals , so an involution diagonalizes to a signature matrix. A normal involution is Hermitian (complex) or symmetric (real) and also unitary (complex) or orthogonal (real). The determinant of an involutory matrix over any field is ±1. [4]

  7. Transpose - Wikipedia

    en.wikipedia.org/wiki/Transpose

    In linear algebra, the transpose of a matrix is an operator which flips a matrix over its diagonal; ... The operation of taking the transpose is an involution ...

  8. Cartan decomposition - Wikipedia

    en.wikipedia.org/wiki/Cartan_decomposition

    A Cartan involution on () is defined by () =, where denotes the transpose matrix of .; The identity map on is an involution. It is the unique Cartan involution of if and only if the Killing form of is negative definite or, equivalently, if and only if is the Lie algebra of a compact semisimple Lie group.

  9. Involution - Wikipedia

    en.wikipedia.org/wiki/Involution

    Involution (mathematics), a function that is its own inverse; Involution algebra, a *-algebra: a type of algebraic structure; Involute, a construction in the differential geometry of curves; Exponentiation (archaic use of the term)

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