Interrupting Mathematica

Mathematica produces the required result very quickly. However, in the
event of some complicated calculations, it takes some time to
complete. There is also a considerable delay while using a new symbol
or asking information on existing symbols.

If you want to stop Mathematica in the middle of a calculation you can
hit Control-c from the keyboard. On doing so, Mathematica prints:

	Interrupt:
        	continue (or c) to continue
	        show (or s) to show current operation (and then continue)
        	trace (or t) to show all operations
	        abort (or a) to abort current calculation
	        exit (or quit) to exit program
	?
You can give any of the above instructions depending on what you want
to do.