mathworld.wolfram.com
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MathWorld (Wolfram) is a comprehensive online encyclopedia of mathematics with detailed articles on a wide range of topics, including inequalities. Each entry provides definitions, theorems, formulas, explanations, and worked examples with links to related concepts.
More resources on Inequalities
Art of Problem Solving Wiki: Inequalities
Comprehensive wiki on various inequalities.
Algebra: Inequalities
Master inequalities! This Algebra course from Sal Khan et al. explains solving, graphing, and applying inequalities.
Inequalities
Master inequalities! This course covers techniques & problem-solving, perfect for math competitions and beyond. Join AoPS!
khanacademy.org
Khan Academy is a free online learning platform offering instructional videos, interactive exercises, and quizzes across math and other subjects. It provides comprehensive lessons on inequalities with step-by-step tutorials, worked examples, and practice problems.
College Algebra
Coursera course: Basic Math: Algebra
Algebra: Elementary to Advanced
Coursera course: Algebra: Elementary to Advanced - Polynomials and Roots