Which mathematical concept is MOST commonly used in retail recommendation systems to identify patterns in customer purchasing behavior?

Retail analytics combines mathematical principles with consumer behavior to optimize sales strategies. Modern retailers use various mathematical models and algorithms to analyze patterns, predict trends, and maximize profits. This trivia question explores how mathematical concepts are specifically applied in contemporary retail analytics systems to enhance decision-making and customer experience.

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Collaborative filtering algorithms based on matrix factorization
Fibonacci sequence analysis of purchasing intervals
Euclidean geometry for store layout optimization
Fourier transforms of seasonal sales cycles