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Mathematica quits (exits) when the single notebook I'm working on is closed. How to prevent this? Win7, v10 Mathematica

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I take it you mean the application mathematica exits, including the front end. The kernel is only the part that does the computations. – Jacob Akkerboom Jul 14 '14 at 17:24
Does this happen after copying or cutting a large amount of data from the notebook before closing? I'm asking because that's the situation where it happens to me on OS X with v. 10. – Jens Jul 14 '14 at 19:54

V10 has the option to have the program quit after the last window closes. Initially, you are prompted for your choice of the appropriate action after the last window closes:

Mathematica graphics

If you check the checkbox at the bottom right the default action will be to quit and the dialog box won't be shown again. I presume you must have clicked it at some time. As pointed out by Simon Woods this can be undone using the Preferences control panel:

Mathematica graphics

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