A type of abstract Space which occurs in Spline and Rational Function approximations. The Besov space is a complete quasinormed space which is a Banach Space when , (Petrushev and Popov 1987).
References
Bergh, J. and Löfström, J. Interpolation Spaces. New York: Springer-Verlag, 1976.
Peetre, J. New Thoughts on Besov Spaces. Durham, NC: Duke University Press, 1976.
Petrushev, P. P. and Popov, V. A. ``Besov Spaces.'' §7.2 in
Rational Approximation of Real Functions. New York: Cambridge University Press, pp. 201-203, 1987.
Triebel, H. Interpolation Theory, Function Spaces, Differential Operators. New York: Elsevier, 1978.