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global assumptions?? How far can I go?
I'm an economist whose accustomed to emphasizing the first orthant in a noncomplex world (positive, real prices; positive, real, quantities) so I really get flustered when Mathematica "pollutes" my output with "using inverse function" warnings and imaginary solutions. Now I've "upgraded" to 5.1 from 4.2 and I find, as I expected from my experience during previous upgrades, that Mathematica is even more anal than it was before. Hence, programs which ran well under 4.2 now are less functional because Mathematica is increasingly careful. So, how global can I go in telling Mathematica to assume that all the variables I create are real?? Must I list an assumption for each variable or each command?? Jees, now it won't even integrate 1/x^2 from 1 to t without dumping a bunch of worries on me. ron