Which mathematical concept forms the foundation of the collaborative filtering algorithms widely used by e-commerce platforms like Amazon to generate 'Customers who bought this also bought...' recommendations?

The e-commerce landscape has been revolutionized by sophisticated mathematical tools that optimize everything from inventory management to customer recommendations. Behind the sleek interfaces of modern online shopping platforms lies a complex world of algorithms and statistical models. This poll tests your knowledge about how mathematical principles have shaped the analytics technology that powers today's digital retail environment.

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Matrix factorization and linear algebra
Differential calculus and optimization theory
Euclidean geometry and trigonometric functions
Number theory and modular arithmetic