Banach space
Noun

Banach space (plural Banach spaces)

  1. (functional analysis) A normed vector space which is complete with respect to the norm, meaning that Cauchy sequences have well-defined limits that are points in the space.
    • 1962 [Prentice-Hall], Kenneth Hoffman, Banach Spaces of Analytic Functions, 2007, Dover, page 138 ↗,
      Before taking up the extreme points for H^1 and H^\infty, let us make a few elementary observations about the unit ball \Sigma in the Banach space X.
    • 1992, R. M. Dudley, M. G. Hahn, James Kuelbs (editors), Probability in Banach Spaces, 8: Proceedings of the Eighth International Conference, Springer, page ix ↗,
      Already in these cases there is convergence in Banach spaces that are not only infinite-dimensional but nonseparable.
    • 2013, R. E. Showalter, Monotone Operators in Banach Space and Nonlinear Partial Differential Equations, American Mathematical Society, page 35 ↗,
      [A] Banach space is a complete normed linear space X. Its dual space X' is the linear space of all continuous linear functionals f : X \rightarrow\mathbb{R}, and it has norm \left\Vert f\right\|_{X'}\equiv \text{sup}\left\{\left\vert f(x)\right\vert : \left\Vert x\right\Vert \le 1\right\}; X' is also a Banach space.
Translations
  • French: espace de Banach
  • German: Banach-Raum
  • Italian: spazio di Banach
  • Russian: ба́нахово простра́нство



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