found me a new box of books from my dad’s undergrad so I pulled out the ones that might be useful next year. the linear book on the bottom he got from the university library last year ish because he gets access to the free teacher versions and samples that publishers send. he also found his 4th ed boyce and diprima elementary differential equations which is the same book that I have in the gray binder, I just have the new edition (I think 11)















