mathworld.wolfram.com
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MathWorld is a comprehensive online mathematics encyclopedia with detailed entries on algebraic numbers and related topics like polynomials and field extensions. Each article provides definitions, theorems, examples, formulas, and links to related concepts for learners.
More resources on Algebraic Numbers
Stack Exchange: Algebraic Number Theory
Q&A on algebraic numbers
nLab: Algebraic Number
Comprehensive reference on algebraic numbers
Algebraic Number Theory
Learn algebraic number theory with Prof. Benedict Gross! Explore algebraic numbers and their properties in this comprehensive course.
ocw.mit.edu
MIT OpenCourseWare is a free, openly licensed collection of MIT course materials. It provides complete course content—syllabi, lecture notes, assignments, exams, and often video lectures—across a wide range of subjects, including mathematics, useful for studying topics related to algebraic numbers.
nptel.ac.in
NPTEL is an Indian online learning platform from IITs and IISc offering free video lectures, course notes, and assignments across engineering, science, and humanities, with mathematics courses that cover topics like algebra and number theory.