Chapter 9: Problem 16
$$ \text { Verify }(9-24) $$
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Chapter 9: Problem 16
$$ \text { Verify }(9-24) $$
These are the key concepts you need to understand to accurately answer the question.
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Let \(p=(x, y, z)\) and \(r-|p| .\) Find the gradient of the functions \(r^{2}, r, 1 / r, r^{m}\), and \(\log r\).
Show that $$ \begin{aligned} (A d x&+B d y+C d z)(a d x+b d y+c d z) \\ &=\left|\begin{array}{ll} B & C \\ b & c \end{array}\right| d y d z+\left|\begin{array}{ll} C & A \\ c & a \end{array}\right| d z d x+\left|\begin{array}{ll} A & B \\ a & b \end{array}\right| d x d y \end{aligned} $$
If such exist, find integrating factors for the following differential forms: (a) \(\left(x^{2}+2 y\right) d x-x d y\) (b) \(3 y z^{2} d x+x z^{2} d y+2 x y z d z\) (c) \(x y d x+x y d y+y z d z\)
(a) If \(g\) is harmonic in \(\Omega\) and the normal derivative of \(g\) on the boundary is 0 , show that 1 \(\nabla g=0\) in \(\Omega\) (b) Let \(g\) and \(g^{*}\) be harmonic in \(\Omega\), and let \(\partial g / \partial \mathbf{n}=\partial g^{*} / \partial \mathbf{n}\) on \(\partial \Omega\). Show that \(g^{*}=g+K\) where \(K\) is constant.
Verify the following: (a) \((3 x d x+4 y d y)\left(3 x^{2} d x-d y\right)=-\left(3 x+12 x^{2} y\right) d x d y\) (b) \(\left(3 x^{2} d x-d y\right)(3 x d x+4 y d y)=\left(3 x+12 x^{2} y\right) d x d y\). (c) \((x d y-y z d z)(y d x+x y d y-z d z)=\left(x y^{2} z-x z\right) d y d z-y^{2} z d z d x-x y d x d y\). (d) \(\left(x^{2} d y d z+y z d x d y\right)(3 d x-d z)=\left(3 x^{2}-y z\right) d x d y d z\). (e) \((d x d y-d y d z)(d x+d y+d z)=0 .\) (f) \((d x-x d y+y z d z)\left(x d x-x^{2} d y+x y z d z\right)=0 .\)
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