This homework is due Wednesday, February 24.
Solve the following problems from Chapter 3 of the textbook: 2, 4, 5, 7, 9, 10, 26.
In addition, solve the following problem:
Let be a linear map between finite dimensional vector spaces over
For
we denote by
the preimage of
under
This is the set of all vectors
such that
Recall that a subset of a vector space
over
is convex iff whenever
and
then also
Show that
is convex iff
is convex. Is it necessary that
is linear for this to hold, or does it suffice that
is continuous?
Assume that is a subspace of
and show that
is a subspace of
When you ask the question “Is it necessary that
is linear for this to hold, or does it suffice that
is continuous?”, did you want simply our opinion or did you want a proof/counterexample. If a proof/counterexample is desired, can we clarify what topology we have on
and
. My guess is since they are finite dimensional and isomorphic to
for some
and
is a metric space, we would use that.
Yes, I am thinking of
as
and I would like a proof or a counterexample in this context.