I am currently taking an intro to macroeconomics class, and I am looking for undergraduate level study material to understand the IS-LM model and its interactions with the AS-AD model. Can you give me any good recommendation? I have no problems dealing with any math intensive material. The textbook that I am reading at the moment is Macroeconomics by Olivier Blanchard.
Short opinion pieces/notes by Paul Krugman which might be interesting for the new students of macroeconomics:
Blanchard is a good text. I am not sure what exactly you are looking for. Most undergrad macro texts are written in a similar way. But if you want to check an alternative presentation of the material, I recommend Mankiw's Macroeconomics. If memory serves me well, Blanchard uses a medium-run AS while Mankiw prefers to use short-run and long-run curves. It is possible that both authors present LM curves differently.