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using operators (+,-,*,/) in variables

Asked by Alex on 3 Dec 2014 at 11:55
Latest activity Answered by Azzi Abdelmalek on 3 Dec 2014 at 12:14
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Matrix with differential operators - HELP

Asked by rodrigo on 9 Oct 2013
Latest activity Commented on by Cedric Wannaz on 16 Oct 2013
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