I did my undergrad 10 years ago, and am essentially a hobbyist, myself currently working through Strang DE since I found Boyce uninstructive. The brief dialog o

I did my undergrad 10 years ago, and am essentially a hobbyist, myself currently working through Strang DE since I found Boyce uninstructive. The brief dialog on centered difference certainly raised my eyebrow, since Strang in an effort to more explicitly relate difference and differentials calls those out early, whereas the first time through the material I hadn't seen that interpretation until taking signals.