Which mathematical concept is primarily responsible for the success of modern e-commerce recommendation engines that suggest 'Products you might like'?

The intersection of mathematics and e-commerce has created powerful tools for analysis, prediction, and optimization. Mathematical algorithms drive everything from recommendation systems to inventory management in modern online retail. This trivia question explores how specific mathematical concepts have transformed e-commerce platforms and shaped the digital shopping experience we know today.

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Collaborative filtering algorithms based on matrix factorization
Laplace transforms for signal processing
Euclidean geometry for spatial modeling
Differential calculus for optimization curves