Posts Tagged ‘problems’

Gmail’s status: POP is enabled for all mail that has arrived since 8/26/06

April 21, 2011 1 comment

This is pretty funny. I don’t know how it happened nor why this can solve it. All I know is this will work out somehow.

Brief descriptions: POP did not download e-mails from Gmail account before a specific date.

Symptoms: I set up POP in Thunderbird and download e-mails from Gmail account. All went well except that e-mails arrived before  8/26/06 were not downloaded to my computer. No matter what I did the emails wouldn’t get downloaded. So I revisited the setting in the Gmail account >mail setting>Forwarding and POP/IMAP>POP Download and I found that it showed “POP is enabled for all mail that has arrived since 8/26/06” which corresponding exactly with the not-downloaded emails in the gmail account. However, I don’t know how to change the date. I ticked at “Enable POP for all mail (even mail that’s already been downloaded)” and saved the changes, but that did not help.

Here is the trickery…I don’t know how or why though. I ticked on “Enable POP for mail that arrives from now on” then save the changes. After that I ticked “Enable POP for all mail (even mail that’s already been downloaded)” then save the changes. Now it works!

Here they discussed the same problems too

Categories: Uncategorized Tags: , , ,

Uninstall Ubuntu from dual boot Windows 7

June 24, 2010 Leave a comment

Recently I installed Ubuntu 9.10 on a 2-monitor machine stored with windows7, but Ubuntu seems to have some problem with graphic card on this 2-monitor machine. Somehow, I cannot find a good driver for it, so decide to uninstall Ubuntu 9.10 from this dual boot Windows7. I realized that there might be 2 problems: 1) GRUB and MBR, 2) how to resize the Windows partition after Ubuntu uninstalled? I found a very easy-to-follow instruction video on; it works perfectly in my situation, so hopefully it works for you too!

Uninstall Ubuntu From Dual Boot Vista WITHOUT An Installation CD by yng63un [link]

The software to use is EasyBCD which can be downloaded for free.

Categories: Tutorials Tags: , , , ,

Mathematical Problems for Students

August 20, 2009 Leave a comment

Here I intend to put together a collection of mathematical problems from anywhere I can find it. There are tons of mathematical competitions in the world, you may want to visit an old post of mine “List of mathematics competitions.” Your suggestion is always welcome.

Good resources in General

  • American Mathematics Competitions (AMC): The web page contains a lot of interesting mathematics problem and tutorial websites [link]
  • MathLinks: A great resource on mathematical competitions.
  • Canadian Mathematical Society (CMS): The website contains tons of math problems and solution from other official competitions around the world. [link]
  • Donny’s Gaussian Tech: This guy, Donny, makes an interesting web page for several competitions [link]. He also has his lecture on as well [link]

American High School Mathematics Examination (AHSME)

  • Texas State University: Problems and solutions [link]
  • MathLinks: Problem and solutions [link]

Asian Pacific Mathematics Olympiad (APMO)

  • MathLinks: Problems and solutions [link]

United States of America Mathematical Olympiad (USMO)

  • USAMO in AMC: Archive, problems and solutions [link]
  • MathLinks: Problems and solutions [link]

keywords: ACM, AHSME, AIME, IMO, APO

Categories: Academics Tags: ,