On 12/02/2013 8:22 PM, Christian Froeschlin wrote:
> Stephen wrote:
>
>>> Since you are dealing with lines in 3-space (x,y,z), the lines will only
>>> intersect if they lie on the same plane.
>
>> Can that be right?
>
> take two pens, and you will find you can easily hold them
> so that they do not intersect, are not parallel, and with the
> point of closest approach clearly within the physical pen
> boundaries (and not just their projection to infinity).
>

Yes, that is true.

>> What about the lines of the three axis?
>
> any two axes lie within a plane and intersect at the origin.

And is the third axis, in 3D space, in the same plane as the plane of 
the first two axis?


-- 
Regards
     Stephen

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