mathworld.wolfram.com
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MathWorld is an extensive online mathematics encyclopedia by Wolfram that provides detailed explanations of mathematical concepts. It includes clear definitions, theorems, proofs, and worked examples—covering topics such as group, ring, and module homomorphisms and their related ideas.
More resources on Homomorphisms
Abstract Algebra Playlist
Trefor Bazett's full Abstract Algebra series including homomorphisms
nLab: Homomorphism
Comprehensive category theory perspective on homomorphisms
Abstract Algebra
Learn abstract algebra homomorphisms with Prof. Benedict Gross! Explore key concepts in this insightful course.
Algebra I
Learn homomorphisms in Algebra I with this course from Michael Artin at MIT. Explore key concepts and build your algebra skills!
ocw.mit.edu
MIT OpenCourseWare is a free, comprehensive collection of MIT course materials available online. It includes lecture notes, assignments, exams, and video lectures across hundreds of subjects, including mathematics and algebra topics where you can learn about homomorphisms.
abstract.ups.edu
University of Puget Sound's Abstract Algebra resource site, offering lecture notes and course materials for an abstract algebra course. It covers core topics such as groups, rings, and modules, with a focus on homomorphisms, including definitions, theorems, and practice problems.