nptel.ac.in
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nptel.ac.in is India's National Programme on Technology Enhanced Learning, an online education platform offering free and paid courses with video lectures, notes, assignments, and exams across engineering, science, and humanities, with certificates on completion.
More resources on Ordinals
Cantor's Paradise: Ordinal Numbers Explained
Accessible article on ordinals from beginner to advanced
Stanford Encyclopedia of Philosophy: Set Theory
Section on ordinals and transfinite recursion
nLab: Ordinal
Comprehensive reference on ordinals in category-theoretic context
Set Theory
Learn ordinal numbers with William Hamilton's Set Theory course! Explore fundamental concepts and deepen your understanding.
mathworld.wolfram.com
MathWorld is Wolfram’s comprehensive online mathematics encyclopedia offering concise, authoritative articles that define and explain mathematical concepts, theorems, and formulas. It covers topics across math, including set theory and ordinal numbers, with explanations, examples, and references.
ocw.mit.edu
MIT OpenCourseWare (OCW) is a free, openly accessible repository of MIT course materials—lecture notes, assignments, exams, and sometimes video lectures—spanning a wide range of subjects. It enables self-paced study and exploration of topics such as mathematics that may cover ordinal concepts.
