So, I seem to be drawing some blanks - my calc III is a little rusty.
Find the max(2x+2y+z) and min(2x+y+z) on the surface x2+y2+z2=1
At first I thought I would take partial derivatives, but none of them yield 0, so that's not going to work. Any suggestions would be mighty helpful because...
Could someone please help me show that if A is Hermitian
\left\|(A-\lambda I)^{-1}\right\|_{2}=\frac{1}{min_{\lambda_{i}\in\sigma(A)}|\lambda-\lambda_{i}|}
where \sigma(A) denotes the eigenvalues of A.
I have figured out how to solve the norm without an inverse, but the inverse confuses me...
Hi. I'm having difficulty remembering how to solve for u(r).
The equation is r*u''+u'=0 with BC u(2)=20; u(1)=540.
Any help would be appreciated. I really need help setting up how to solve. Thanks.