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1 definition found
From The Free On-line Dictionary of Computing (05 January 2017) [foldoc]:
Banach space
A complete normed vector space. Metric is
induced by the norm: d(x,y) = ||x-y||. Completeness means
that every Cauchy sequence converges to an element of the
space. All finite-dimensional real and complex normed
vector spaces are complete and thus are Banach spaces.
Using absolute value for the norm, the real numbers are a
Banach space whereas the rationals are not. This is because
there are sequences of rationals that converges to
irrationals.
Several theorems hold only in Banach spaces, e.g. the {Banach
inverse mapping theorem}. All finite-dimensional real and
complex vector spaces are Banach spaces. Hilbert spaces,
spaces of integrable functions, and spaces of {absolutely
convergent series} are examples of infinite-dimensional Banach
spaces. Applications include wavelets, signal processing,
and radar.
[Robert E. Megginson, "An Introduction to Banach Space
Theory", Graduate Texts in Mathematics, 183, Springer Verlag,
September 1998].
(2000-03-10)