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At 04:02 PM 8/4/00 -0500, Jack Uretsky wrote:Ahh, yes. A right-handed vortex in flatland is different from
There can only be one inversion in 3-space
...
because two co-ordinates determine a plane and the "handednedness"
of the co-ordinate system is determined by the orientation of
the 3rd co-ordinate.
Depending on how one parses the sentence, that's narrowly true, but it can
easily be misinterpreted. Two-dimensional creatures in Flatland can
exhibit handedness, so "the 3rd co-ordinate" can't be the general
definition of what determines handedness.