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Haar space
In
approximation theory
, a
Haar
space
or
Chebyshev
space
is a
finite-dimensional
subspace
of, where is a
compact space
and either the
real numbers
or the
complex numbers
, such that for any given there is
exactly one
element of
that
approximates
"best", i.e. with
minimum distance
to in
supremum norm
.