1.

Application of quadratic form ?​

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Answer:

If you have a function f:Rn⟼R, and find points where ∇f=0, then the QUADRATIC form TELLS you whether it is a saddle point, a min or a max. There is a huge number of applications in probability and STATISTICS: Modeling "linear" dependence between random variable through second MOMENTS (covariances and correlations).



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