<p>Paul's Online Math Notes is a free collection of self-study mathematics notes by Paul Dawkins, an instructor at Lamar University. The site covers Algebra, Calculus I–III and Differential Equations with fully worked examples, practice problems with solutions, and downloadable PDFs.</p> <ul> <li>Topics: Algebra, Calculus I, Calculus II, Calculus III and Differential Equations.</li> <li>Supplementary cheat sheets for algebra, trigonometry and calculus, plus a complex-number primer and guides on common mathematical errors.</li> <li>Interactive web notes and PDF downloads for offline study.</li> <li>Completely free with no account or sign-up required.</li> <li>Aimed at JC- and university-level learners, and widely used as a supplement to school coursework worldwide.</li> </ul> <p>Access the materials directly at tutorial.math.lamar.edu; no registration needed.</p>