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Question: sqrt(4)=?

Question:sqrt(4)=?

mplsr 21 Maple
assign
December 19 2007
1
I have difficulties understanding why exactly Maple finds the question difficult to answer. First attempt: assume(a>0); a:=sqrt(b^2); eval(a, b=2); (1/2) / 2\ a := \b / (1/2) 4 I suppose the problem is that after the assignment Maple forgets the assumption a>0(?). Is there a way to make _real_ assumptions on variables, which Maple will not forget and possibly warn me if I try to violate? Second attempt: c:=sqrt(d^2); assume(c>0); eval(c, d=2); (1/2) / 2\ c := \d / (1/2) 4 What is the problem here? P.S. I assume everyone (except Maple) knows that 2x2=4.
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