A First Course in Differential Equations
by Dennis G. Zill · first published 1993
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on “Ask HN: What are your favourite textbooks?” ↗…here), and for calculus, "No BS Guide to Math/Physics" by the same author. These books both include a review of high school math (i.e. trig) which i needed. For DiffEq I currently recommend Logan's "A First Course in Differential Equations", this is where I am now and I found this the most gentle after trying several textbooks recommended from r/math. Context: I am an adult with an engineering degree from 20 yrs ago.
on “All of Physics in 9 Lines” ↗…ideas are built on understanding the previous ideas first), you can self-study a lot of mathematics. But almost everyone (mathematicians, physicists, engineers) who has that maturity, has probably taken a first course in differential equations during their undergrad studies. So the number of people who have developed some mathematical maturity without ever taking a diff.eq. course is probably small. So we don't know much about these people…
on “A First Course in Differential Equations for Scientists and Engineers” ↗