nLab: Monad
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Comprehensive reference on monads
More resources on Monads
Category Theory for Programmers
Learn Monads with Bartosz Milewski's "Category Theory for Programmers" course! Master functional programming concepts.
ncatlab.org
nLab is a collaborative online encyclopedia for higher mathematics with a strong emphasis on category theory, offering definitions, explanations, and references for monads, higher categories, and related concepts.
mathworld.wolfram.com
MathWorld is a comprehensive online mathematics encyclopedia from Wolfram Research, offering detailed articles on mathematical concepts with definitions, formulas, and illustrative diagrams. It covers a wide range of topics—from algebra and calculus to probability, topology, and discrete math—serving as a reference and learning resource.
ocw.mit.edu
MIT OpenCourseWare is a free, open-access repository of MIT course materials, including lecture notes, assignments, exams, and video lectures. It lets you browse courses across many subjects and study at your own pace by downloading resources such as syllabi, problem sets, labs, and lectures.