Boris Demidovich’s Problems in Mathematical Analysis is legendary (and notorious) among STEM students. It isn’t a textbook that explains theory; it is a massive collection of over 4,000 problems designed to build "mathematical muscle" through sheer repetition and increasing difficulty. 1. Know What It Is (and Isn't)
The "Demidovich Calculus" isn't just a book; it’s a marathon. It is arguably the most rigorous way to ensure you never struggle with calculus again. If you can survive the Demidovich grind, the rest of your engineering or physics curriculum will feel like a walk in the park.
If you're interested in exploring more resources on Demidovich calculus, here are some additional suggestions: