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Question: Label=_L2

Question:Label=_L2

william budd 268 Maple
June 04 2007
0
I get RootOf(_Z^2-3, label = _L2) in an answer. My understanding is that RootOf _Z^2-3 would be a root of Z^2-3=0 or plus or minus the square root of 3, but after reading the RootOf help sheet I still cannot figure out what label = _L2 means. My gut feeling is that it means one of the two roots, either -sqrt(3) or +sqrt(3) but that bothers me because I think that both are ligitimate solutions to the problem. Could someone please explain what label = _L2 means? The help sheet says something about label=e where e can be anything which wasn't at all helpful. Thanks. P.S. The problem that provided this issue is solve({x^2-y^2=y,2*x*y=x}) and in the second equation the x on each side should not be cancelled because x=0 is one solution. (Rearranging, 2xy-x=0,x(2y-1)=0,thus x=0 is a solution etc.)
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