We study the interior weighted Sobolev regularity for weak solutions of the quasilinear equations of
the form
. The vector
field
is allowed to
be discontinuous in
,
Hölder continuous in
and its growth in the gradient variable is like the
-Laplace operator with
. We establish interior
weighted
-regularity
estimates for weak solutions to the equations for every
assuming that the weak solutions are in the local John–Nirenberg
space. This paper therefore improves available results because it replaces the
boundedness or continuity assumption on weak solutions by the borderline
one. Our regularity estimates also recover known results in which
is independent
of the variable
.
Our regularity theory complements the classical
-regularity
theory developed by many mathematicians including DiBenedetto and Tolksdorf for
this general class of quasilinear elliptic equations.