ProofWiki - Relations
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Comprehensive wiki with proofs and definitions for relations
More resources on Relations
PlanetMath - Binary Relation
Encyclopedia entry on binary relations in set theory
Mathematics for Computer Science
Learn relations, a core concept in computer science, with this course by Albert R. Meyer at MIT. Dive into essential mathematical tools!
mathworld.wolfram.com
MathWorld is a comprehensive online mathematics encyclopedia from Wolfram Research, featuring detailed articles on topics like relations, functions, sets, and more. Each entry includes definitions, theorems, formulas, examples, and diagrams to explain concepts.
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.
ocw.mit.edu
MIT OpenCourseWare (OCW) provides free, openly licensed MIT course materials—lecture notes, assignments, exams, and some video lectures—across a wide range of subjects. It’s a great place to study topics related to relations and discrete mathematics at your own pace using high-quality university content.
Elements of Set Theory
Elements of Set Theory - A book resource