In this paper we consider properties of medians as they pertain to the continuity and vanishing oscillation of a function. Our approach is based on the observation that medians are related to local sharp maximal functions restricted to a cube of R n .
A local median decomposition is used to prove that a weighted mean of a function is controlled locally by the weighted mean of its local sharp maximal function. Together with the estimate
M
0
,
s
♯
(
T
f
)
(
x
)
≤
c
M
f
(
x
)
M^{\sharp }_{0,s}(Tf)(x) \le c\,Mf(x)
for Calderón-Zygmund singular integral operators, this allows us to express the local weighted control of
T
f
Tf
by
M
f
Mf
. Similar estimates hold for
T
T
replaced by singular integrals with kernels satisfying Hörmander-type conditions or integral operators with homogeneous kernels, and
M
M
replaced by an appropriate maximal function
M
T
M_T
. Using sharper bounds in the local median decomposition we prove two-weight,
L
v
p
−
L
w
q
L^p_v-L^q_w
estimates for the singular integral operators described above for
1
>
p
≤
q
>
∞
1>p\le q>\infty
and a range of
q
q
. The local nature of the estimates leads to results involving weighted generalized Orlicz-Campanato and Orlicz-Morrey spaces.
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