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2012-03-21 17:21:05 +0200 asked a question out of core exact linear algebra

I'm trying to solve a large (17000x250000) sparse (density=0.01) system over the rationals. Are there any routines in Sage (or out) that could give the reduced row echelon form, or the null space?

Everything I've looked into either runs out of memory or isn't exact.