Art of Problem Solving Wiki - Diophantine Equations
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Comprehensive wiki with examples and proofs
More resources on Diophantine Equations
MathWorld - Diophantine Equation
Detailed encyclopedia entry
Brilliant.org - Diophantine Equations
Interactive problems and explanations (free tier)
mathworld.wolfram.com
MathWorld is Wolfram's expansive online mathematics encyclopedia. It provides rigorously written articles on topics across math, including Diophantine equations, with definitions, theorems, formulas, diagrams, worked examples, and links to related concepts.
An Introduction to Diophantine Equations
An Introduction to Diophantine Equations - A book resource
ocw.mit.edu
MIT OpenCourseWare offers free, openly licensed course materials from MIT across many subjects, including mathematics, featuring lecture notes, assignments, exams, and sometimes video lectures. It provides self-paced access to math courses and resources on topics like number theory and Diophantine equations.
nptel.ac.in
NPTEL is a government-backed online learning platform offering free video-based courses in engineering and sciences from IITs and IISc, featuring lecture videos, readings, quizzes, and optional certificates.