[Math] 2nd Taylor Expansion and Hessian Matrix

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Hessian Matrix definition by wiki
Hessian Matrix example
http://www.cs.huji.ac.il/~csip/tirgul3_derivatives.pdf

Hessian matrices are used in large-scale optimization problems within Newton-type methods because they are the coefficient of the quadratic term of a localTaylor expansion of a function.

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