I have put online the reading for today as swel as the suggested exercises.
The book does a good job of presenting the material in definition statement and proof format so I will not write notes.
I will try to upload the solution of the blood donor exercises we did in class. I did a beginner mistake in findinc the cut: you have to use backward edges that have a positive flow too so P={\alpha ABd, ABp, Ad, Ap}
to compute the capacity you have to consider the capacities of edges from P to P^c (not in the opposite order) so it is
39+34+45+50=168 which is the value of the flow we found and one less the number of patients that need blood.