ocw.mit.edu
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MIT OpenCourseWare is a free, public repository of MIT course materials across disciplines, including mathematics and category theory. It provides lecture notes, assignments, exams, and sometimes video lectures from actual MIT courses, helping learners study topics like adjoint functors.
More resources on Adjoint Functors
nLab: Adjoint Functor
In-depth reference with definitions, examples, and references
Lectures on Category Theory
Learn about adjoint functors with Martin Brandenburg's "Lectures on Category Theory"! This course offers a deep dive into this key topic.
Category Theory
Learn adjoint functors with Bartosz Milewski's Category Theory course! Understand this key concept and advance your functional programming skills.
ncatlab.org
nLab is a collaborative online wiki and knowledge base focused on category theory, higher category theory, and related areas of mathematics and theoretical computer science. It provides extensive, interconnected articles—definitions, explanations, formal notes, diagrams, and references—on topics like adjoint functors, monads, topos theory, and beyond.
mathworld.wolfram.com
MathWorld is a comprehensive online mathematics encyclopedia by Wolfram that provides in-depth articles, definitions, and visual examples across a broad range of topics. It includes entries on category theory and adjoint functors, offering explanations, formulas, and references for further study.