Understanding Vector Calculus: Proofs and Applications

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SUMMARY

This discussion focuses on the application of vector calculus, specifically addressing the computation of the Hessian matrix and the gradient of a composite function. The user seeks clarification on how to connect the results from part A of their homework to parts B and C, particularly regarding the interpretation of the function F as a composition of little f and r(x). The discussion highlights the importance of understanding the relationship between the gradient and the composition of functions, as well as the implications of setting n=3 in the context of summing functions.

PREREQUISITES
  • Understanding of vector calculus concepts, particularly gradients and Hessians.
  • Familiarity with composite functions and their derivatives.
  • Knowledge of the notation and operations involved in calculus, such as grad and summation.
  • Experience with function composition in mathematical analysis.
NEXT STEPS
  • Study the derivation and application of the Hessian matrix in multivariable calculus.
  • Learn about the chain rule in the context of vector calculus, particularly for composite functions.
  • Explore examples of gradient computations for various functions to solidify understanding.
  • Review the implications of summation notation in calculus, especially in relation to function limits.
USEFUL FOR

Students studying vector calculus, mathematicians focusing on multivariable functions, and educators seeking to clarify concepts related to gradients and Hessians.

weihead
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Homework Statement



http://photos-f.ak.fbcdn.net/hphotos-ak-ash1/hs425.ash1/23519_677242553394_6313872_37501934_8229842_n.jpg

I'm unsure as to how to approach part b and c... I figured out part A but I don't know how it ties into part b. Is it saying that F is a function of little f composed r(x) at x^?


Intuitively I should sub in part a into part b but I'm not sure.
Also, for part c..when it says n=3, does it mean that it is the sum of all the functions of x from 1 to 3? so the function I'm computing the Hessian for would be 1/3x^2?
 
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For b I think you are supposed to realize that grad(g(r))=g'(r)*grad(r). I'm not really sure where they are going with c.
 

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