ProofWiki: Well-Ordering Theorem
Unknown
Formal proof and axioms
More resources on Well-Ordering Theorem
nLab: Well-ordering theorem
Comprehensive overview with references
mathworld.wolfram.com
MathWorld is Wolfram’s comprehensive online mathematics encyclopedia featuring in-depth articles, definitions, explanations, examples, and diagrams across a wide range of mathematical topics. It provides topic pages with references and related resources, including articles on fundamental concepts like the Well-Ordering Theorem.
ocw.mit.edu
MIT OpenCourseWare offers free, openly accessible MIT course materials—lecture notes, assignments, exams, and video lectures—across hundreds of subjects. It includes mathematics courses that cover topics such as set theory and the Well-Ordering Theorem.
nptel.ac.in
NPTEL is a large online learning platform offering IIT-authored video lectures, course materials, assignments, and certificates across engineering, science, and mathematics. It hosts math courses and lecture content on foundational topics and theorems, including proof-based material relevant to concepts like the Well-Ordering Theorem.
Introduction to Mathematical Thinking
Learn how to think the way mathematicians do – a powerful cognitive process developed over thousands of years. Mathematical thinking is not the same as doing mathematics – at least not as mathematics is typically presented in our school system. School math typically focuses on learning procedures to solve highly stereotyped problems. Professional mathematicians think a certain way to solve real problems, problems that can arise from the everyday world, or from science, or from within mathematics itself. The key to success in school math is to learn to think inside-the-box. In contrast, a key feature of mathematical thinking is thinking outside-the-box – a valuable ability in today’s world. This course helps to develop that crucial way of thinking.