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Example (Continued)
R
x
R
=
union
_
a
in
R
x
R
[
a
]
r
The plane is partitioned into the set of all these lines:
We can determine a "canonical representative" for each such line:
R
x
R
=
union
_
y
in
R
[<0,
y
>]
r
Author:
Wolfgang Schreiner
Last Modification: January 12, 2000