Forgive me if this is in the wrong discussion section. I was unsure as to where this might belong. Can anyone tell me some book titles that deal with the subject of complex numbers or pde's? By this I mean books that use these topics as the choice of discussion and are not mathematical textbooks. for example I'm currently reading "The Riemann Hypothesis: The Greatest Unsolved Problem in Mathematics" by Karl Sabbagh. (Wonderful read by the way. I highly recommend it.) Any thoughts are much appreciated.