If I evaluate a surface $f$$($$x$$)$, that is subjected to a constraint $g$$($$x$$)$, for it's maximum and minimum values using Lagrange Multipliers then how do I know that the solution that is found is maximum or minimum. For example $f$$($$x$$)$= $x^2$+$y^2$+$z^2$ and $g$$($$x$$)$=$x^3$$y^2$$z$=  $6$$\sqrt{3}$ The solution using Lagrange multiplier is ($\sqrt{3}$,$\sqrt{2}$,$1$) But is this point a maxima or minima?
My book tells me that of the solutions to the Lagrange system, the smallest is the minimum of the function given the constraint and the largest is the maximum given that one actually exists.  But what if we only have one point as a solution? How to know whether Lagrange multipliers gives maximum or minimum?
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Symbolic links error while creating Ubuntu UEFI bootable USB I have tried to create UEFI bootable USB drive within Ubuntu 14.10 (Startup disk creator didn't help nor I am interested in using it.). I have formated USB with FAT32 and GPT. So the only thing left to do would be just to copy all files from ISO to USB. That method worked when it comes to Linux Mint 17.1 and Clonezilla live CD, but when I tried to create bootable USB for Ubuntu 14.04 or Kubuntu 15.04 beta 1 there was an error copying files. Actually, on several occasions (4 or 5) pop-up window appeared.   After ignoring this errors, both Ubuntu and Kubuntu USB boot-up just fine, with no apparent problems in Live mode.   Can someone please elaborate what this symbolic links presents? Will this cause some problem when OS is installed?