his section lists some common notations.
is an open subset of
.
is the boundary of
.
is the closure of
.
.
.
.
.
.
.
.
.
For a function
we
denote


(ess sup definition)

where the
is the Lebesgue measure (see the proposition
(
Existence of Lebesgue
measure
)).
,
.
,
is the "Schwartz space" of infinitely differentiable functions
such
that for any polynomial
of finite dimension and any multiindex
we
have


(Schwartz space)

