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when i run a heavy computation on mathematica in the same time even if i want to calculate 2+2 , mathematica does not calculate it until calculating of heavy computation finishes.

why?

another problem is that when i do a heavy computation and obtain results , after closing mathematica and opening it again mathematica do not remember its calculations in that notebook.

for example if the result of calculation is a matrix then after closing and opening of mathematica for manipulating that matrix , for example multiplication it by itself i have to run the heavy computation again and obtain the resulting matrix again.

is there any solution that mathematica without running again a notebook remember calculation of that notebook?

sorry for my bad English writing.

thanks

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# Running simultaneous computation in mathematica

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