mathworld.wolfram.com
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MathWorld is Wolfram's comprehensive online mathematics encyclopedia, offering in-depth articles on a wide range of topics, including differential equations. Each topic provides definitions, theorems, formulas, worked examples, figures, and cross-referenced links to related concepts.
More resources on Differential Equations
ocw.mit.edu
MIT OpenCourseWare provides free, self-contained course materials from MIT across many subjects, including differential equations. You can access lecture notes, assignments, exams, and sometimes video lectures and syllabi from a wide range of courses for self-paced learning.
Differential Equations for Engineers
This course is all about differential equations and covers both theory and applications. In the first five weeks, students will learn about ordinary differential equations, while the sixth week is an introduction to partial differential equations. The course includes 56 concise lecture videos, with a few problems to solve after each lecture. After each major topic, there is a short practice quiz. At the end of each week, there is an assessed quiz. Solutions to the problems and practice quizzes can be found in the instructor-provided lecture notes. Download the lecture notes from the link https://www.math.hkust.edu.hk/~machas/differential-equations-for-engineers.pdf Watch the promotional video from the link https://youtu.be/eSty7oo09ZI
nptel.ac.in
NPTEL is a government-backed online learning platform from IITs and IISc offering free and paid courses across engineering and science, with video lectures, lecture notes, quizzes, assignments, and certificates. It includes differential equations courses and related mathematics content for self-paced study.