Which mathematical technique revolutionized retail personalization and was the foundation of the algorithm that helped Netflix offer a $1 million prize for improving recommendation accuracy?

The retail industry has been transformed by mathematical algorithms that personalize shopping experiences. Major companies invest millions in sophisticated mathematics-based recommendation systems to boost sales and customer satisfaction. Behind these powerful tools are complex equations, statistical models, and machine learning algorithms developed by mathematicians and data scientists. How well do you know the intersection of mathematics and retail personalization?

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Matrix Factorization
Fourier Transforms
Differential Calculus
Markov Decision Processes