Which mathematical concept is primarily used in retail innovation labs when developing 'digital twins' of physical store environments for testing layout efficiency?

Retail innovation labs are increasingly using mathematical models to transform shopping experiences. These labs serve as experimental spaces where retailers test new technologies before wider implementation. Mathematical concepts underpin many cutting-edge retail innovations, from inventory optimization to customer behavior prediction. How well do you know the mathematical foundations behind modern retail innovation labs?

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Graph theory and network optimization
Differential calculus
Number theory
Euclidean geometry