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In the input field, type:
x = 1
y = 1
Then, construct the intersection of these two lines (the point A).
In the input field, type
IsDefined[A]
The answer is true.
Now change the equation "y = 1" to "x = 2". The Algebra View shows:
A = undefined
but IsDefined[A] still returns true.
Curiously, IsDefined[] works well with intersection of segments.
Is this behaviour correct?
Thanks in advance, Humberto.
The same question 
Fixed - 3.1.155.0 online now
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