Open courseware & texts
- MIT OpenCourseWare — 18.01, 18.06, 18.03, 18.100, and more
- OpenStax Calculus (Volumes 1–3)
- OpenIntro Statistics
- Gilbert Strang linear algebra materials
- Paul’s Online Math Notes
- Khan Academy Mathematics
Analysis & deeper reading
- Abbott, Understanding Analysis (Springer)
- Standard calculus texts (Stewart and peers) for computational drill
Visual intuition
- 3Blue1Brown — Essence of calculus / linear algebra
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