I have a notebook open on a sage server, in which sage is computing a complex calculation. If I close the notebook tab in my browser, will sage cancel the calculation, and if not, will it still display the results when I reopen my notebook?
Yes. It will keep on working in the background. But the servers also have timeout for the duration of time a worksheet will be kept open and running. This timeout is quite short. If you are running your own server, then set the timeout by using the timeout parameter. For example, for setting the timeout to be one hour (3600 secs), start the server like this:
$ sage -n timeout=3600
Asked: 2013-03-24 18:01:42 +0100
Seen: 321 times
Last updated: Mar 24 '13
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Not sure if it helps, but you might be able to perform your calculation in the command line interface. Then you would need no browser at all. If you choose to use the command line interface you could be able to close the terminal by using [screen](http://en.wikipedia.org/wiki/GNU_Screen) to run `sage`. :)