Hi,
Two examples:
var('x1,x2')
y=[x1,x2]
opl=solve([x1^2==4,x2^2==9],y,solution_dict=True)
print opl
[{x2: -3, x1: -2}, {x2: -3, x1: 2}, {x2: 3, x1: -2}, {x2: 3, x1: 2}]
var('x1')
y=[x1]
opl=solve([x1^2==4],y,solution_dict=True)
print opl
Traceback (click to the left of this block for traceback)
...
TypeError: [x1] is not a valid variable.
In both cases y is a list.
Roland
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