[lojban-beginners] Re: lojban-beginners Digest V5 #41

[der Mouse <mouse@Rodents.Montreal.QC.CA>]

>   la .iulias. pritu la mari,as. la klaudias.

> 3) Julia is to the right of Maria from Claudia's point of view.
> 5) If Maria (or better someone standing where she is) were to face
>    Claudia, Julia would be on her (Maria's) right.

> That leaves 3 and 5 as contenders, unfortunately, they often give
> opposite results.

> The definition as stated suggests 5, but 3 is better, because 5 is
> ambiguous in situations where there is no up and down defined.

If up and down are undefined, so are left and right.  (At least, if
forward is defined, which is implicit in the notion of facing in a
direction.)  Necessarily, since we can define any one of the three axes
(left-right, up-down, forward-backward) as the cross product of the
other two, so if one of them is ambiguous, at least one of the other
two must be as well.

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