Assignment due in lecture on Friday, Feb. 28:
To do but not hand in:
V-10;
X-1.
To hand in:
N-9, done as described below;
X-2, X-5, X-8, X-11;
AA-2.
For N-9: Use an appropriate ``without loss of generality'' assumption
at the beginning, and later construct inverse isotone maps. (You may
need the easy fact that closed sets in a compact space are compact.)