\(\rho_{\vec{a}, \vec{b}} \overset{\Delta}{=} \frac{\tilde{a} \cdot \tilde{b}}{\|\tilde{a}\|\|\tilde{b}\|}\)

(Boyd and Vandenberghe 2018, 60)

See De-meaned vector.

References

Boyd, Stephen P., and Lieven Vandenberghe. 2018. Introduction to Applied Linear Algebra: Vectors, Matrices, and Least Squares. Cambridge, UK ; New York, NY: Cambridge University Press.