adjoint operator
81Heat equation — The heat equation is an important partial differential equation which describes the distribution of heat (or variation in temperature) in a given region over time. For a function of three spatial variables ( x , y , z ) and one time variable t ,… …
82Observable — This article is about observables in physics. For the use of the term observable in control theory, see Observability. In physics, particularly in quantum physics, a system observable is a property of the system state that can be determined by… …
83POVM — In functional analysis and quantum measurement theory, a POVM (Positive Operator Valued Measure) is a measure whose values are non negative self adjoint operators on a Hilbert space. It is the most general formulation of a measurement in the… …
84Min-max theorem — Variational theorem redirects here. The term is also sometimes applied to the variational principle. In linear algebra and functional analysis, the min max theorem, or variational theorem, or Courant–Fischer–Weyl min max principle, is a result… …
85Finite dimensional von Neumann algebra — In mathematics, von Neumann algebras are self adjoint operator algebras that are closed under a chosen operator topology. When the underlying Hilbert space is finite dimensional, the von Neumann algebra is said to be a finite dimensional von… …
86Kaplansky density theorem — In the theory of von Neumann algebras, the Kaplansky density theorem states thatif A is a * subalgebra of the algebra B ( H ) of bounded operators on a Hilbert space H , then the strong closure of the unit ball of A in B ( H ) is the unit ball of …
87Lumer-Phillips theorem — In mathematics, the Lumer Phillips theorem is a result in the theory of semigroups that gives a sufficient condition for a linear operator in a Hilbert space to generate a quasicontraction semigroup.tatement of the theoremLet ( H , lang; , rang;) …
88Спектральная теорема — В математике, в частности в линейной алгебре и функциональном анализе, термином спектральная теорема обозначают любой из целого класса результатов о линейных операторах или о матрицах. Не вдаваясь в детали можно сказать, что спектральная теорема… …
89Spectrum (functional analysis) — In functional analysis, the concept of the spectrum of a bounded operator is a generalisation of the concept of eigenvalues for matrices. Specifically, a complex number λ is said to be in the spectrum of a bounded linear operator T if… …
90Cayley transform — In mathematics, the Cayley transform, named after Arthur Cayley, has a cluster of related meanings. As originally described by Harvtxt|Cayley|1846, the Cayley transform is a mapping between skew symmetric matrices and special orthogonal matrices …
