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 May 5 comment Customize startup @Mr. Wizard in fact, the documentation says: A notebook with the option setting Saveable->False can always be saved using the Save As menu item, but does not respond to Save and does not prompt for saving when it is closed. May 5 comment Customize startup @Mr.Wizard Mathematica doesn't prompt me to do save the file on closing but when i open this notebook, it is in fullscreen mode and with the right magnification,as desired and what do you exactly mean with "change the properties to maximized". May 5 comment Customize startup Selecting "Full" under Notebook Options/Windows properties/Windows size does nothing but the magnification worked well. Mar 28 comment Trying to prove that $x\sin(\frac{\pi}{x})\ge\pi \cos(\frac{\pi}{x})$ for $x\ge 1$ @Jens thank you very much, Mathematica seems a tricky tool for proving theorems. Mar 28 comment Trying to prove that $x\sin(\frac{\pi}{x})\ge\pi \cos(\frac{\pi}{x})$ for $x\ge 1$ @Jens You are the only one that understood me. Your approach is good but not fully correct since Tan[Pi/x]>=Pi/x is not true for all x > 1. I tried Resolve[ForAll[x, x > 1 && (0 < x < \[Pi]/2 \[Implies] Tan[x] > x), f'[x] >= 0] ] but didn't work. Maybe i'm asking too much from Mathematica. Can you make this work please? Mar 28 comment Trying to prove that $x\sin(\frac{\pi}{x})\ge\pi \cos(\frac{\pi}{x})$ for $x\ge 1$ This is indeed a neat solution to my problem, but my question wasn't too clear, i edited it. Mar 27 comment FindInstance with a Diophantine equation seems to go on forever Mathematica seems to pick the wrong approach, i tried replacing 2012^n with other values and in most of them i ran out of memory, even if the number is very small like 864 Mar 11 comment Unable to convert $\TeX$ input into mathematica Mathematica 8.04 on Windows XP with a pentium 4 Mar 11 comment Unable to convert $\TeX$ input into mathematica I still get the \$failed mistake and i tried all you said. Thank you anyways :)