Which mathematical concept forms the foundation of modern product recommendation engines used by major e-commerce platforms like Amazon and Netflix?

The retail industry has been transformed by mathematical models and algorithms that power everything from inventory management to customer recommendations. Advanced mathematical concepts are now the backbone of modern retail technology platforms. This poll tests your knowledge about how specific mathematical concepts are applied in cutting-edge retail technology advancements that are reshaping the shopping experience and business operations.

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Markov Chain Monte Carlo simulations
Collaborative filtering and matrix factorization
Fourier transform algorithms
Topological data analysis