Thanks for the answer, but i can't calculate matrix of that size you mention and I used the command matrix(ZZ, 3000, 3000), and with 1024mb ram in the virtual machine I obtain the same. I also used sage 4.2 in Ubuntu 9.10 64-bit, and i can calculate 5000 x 5000 matrix, but I need more than that, and when I calculate 8000 x 8000 matrix, my O.S. crashes. May be, I think, is a hardware problem that I have.
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