Omar
Leon
Sanchez,
Department
of
Pure
Mathematics,
University
of
Waterloo
"The
model-companion
of
partial
differential
fields
with
an
automorphism"
We
explain
how
one
can
characterize
the
existentially
closed
models
in
terms
of
differential-algebraic
varieties,
and
then
show
that
this
class
is
elementary
using
characteristic
sets
of
differential
prime
ideals.