Which mathematics textbook series was the first to exceed $100 million in sales through an innovative retail strategy that included complementary online problem repositories?

Mathematical textbooks represent a significant segment of educational publishing, with specialized marketing strategies that have evolved over decades. Major publishers like Pearson, McGraw-Hill, and Springer have developed unique approaches to position their math resources in competitive educational markets. This trivia question explores a notable marketing achievement in the mathematics textbook industry that changed how advanced math content is presented and promoted to students and educators alike.

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Stewart's Calculus series by Cengage Learning, which pioneered the 'Early Transcendentals' approach with WebAssign integration
Pearson's Thomas' Calculus with MyMathLab, featuring interactive tutorials and adaptive learning paths
Princeton University Press's 'Principles of Mathematical Analysis' by Walter Rudin with companion problem-solving portal
McGraw-Hill's Discrete Mathematics series with ALEKS AI-driven practice system and personalized learning