This guy knows what he’s talking about in his book but the problem is that he proves everything by theory. Maybe because the edition I have has not been updated for a while, I find that axioms I read in this book have been proved wrong by Narsingh Deo whose book on Graph Theory is by far the best there is. I’ve done a lot of research and no book or any other resource has given me the information I wanted in it’s precise form.
Euler’s Handshaking Lemma, is really cool and lets you prove theorems in three lines which would have otherwise have required a couple of long pages. Anyway, I’ve studied enough of Discrete Structure. Now got to get back to studying Calculus. Currently, my state of preparation shocks me. I somehow need to clear that exam tomorrow.