Which mathematical concept forms the foundation of collaborative filtering algorithms widely used in e-commerce product recommendation systems?

In the world of modern e-commerce, mathematical algorithms drive personalized shopping experiences. From recommendation engines to dynamic pricing, these mathematical models analyze vast datasets to predict consumer behavior and optimize sales. This poll tests your knowledge about how advanced mathematics powers today's retail innovation. Do you understand the algorithms behind your shopping experience?

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Matrix factorization and singular value decomposition
Euler's identity and complex number analysis
Gödel's incompleteness theorems
Fourier transform and wave equations