khanacademy.org
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Khan Academy is a free online learning platform with short video lessons, practice problems, and quizzes across math, science, computing, and more, including calculus topics like continuity.
More resources on Continuity
Paul's Online Math Notes - Continuity
Comprehensive notes on continuity with examples and proofs
Real Analysis
Learn Real Analysis! Explore continuity with Ravi Vakil's comprehensive course, perfect for building a strong mathematical foundation.
Introduction to Real Analysis
Learn continuity & fundamental concepts in real analysis with this intro course from Dr. Casey Rodriguez. Explore rigorous mathematical proofs!
mathworld.wolfram.com
MathWorld is Wolfram's comprehensive online mathematics encyclopedia with detailed, encyclopedia-style articles on mathematical concepts, definitions, theorems, formulas, and examples. Its extensive coverage includes topics like continuity, calculus, algebra, geometry, and more.
Introduction to Real Analysis
Coursera course: Introduction to Complex Analysis
ocw.mit.edu
MIT OpenCourseWare provides free, openly accessible course materials from MIT's undergraduate and graduate courses, including lecture notes, assignments, exams, and syllabi. It's a self-paced learning resource with content across a broad range of subjects.