In mathematics, the Morrey–Campanato spaces (named after Charles B. Morrey, Jr. and Sergio Campanato)
are Banach spaces which extend the notion of functions of bounded mean oscillation, describing situations where the oscillation of the function in a ball is proportional to some power of the radius other than the dimension.
They are used in the theory of elliptic partial differential equations, since for certain values of
, elements of the space
are Hölder continuous functions over the domain
The seminorm of the Morrey spaces is given by When
, the Morrey space is the same as the usual
, the spatial dimension, the Morrey space is equivalent to
, due to the Lebesgue differentiation theorem.
Note that this is a norm for
The seminorm of the Campanato space is given by where It is known that the Morrey spaces with
are equivalent to the Campanato spaces with the same value of
is a sufficiently regular domain, that is to say, when there is a constant A such that
, the Campanato space is the space of functions of bounded mean oscillation.
, the Campanato space is the space of Hölder continuous functions
, the space contains only constant functions.
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