This page explains the notation and coding we are using on this site compared with writers on the subject.
this site | Doran/Lasenby | Dorst/Fontijne/Mann | |||||
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e1+e2 point at infinity |
n∞ |
n | -∞ | ||||
e1-e2 origin point |
n0 | n (the bar is really on the top but this is easier in html) |
-2 o | ||||
representation of point as null vector |
X = x²n∞+2x-n0 | X = x² n + 2 x -n | p=o + p + ½ p² ∞ | ||||
normalisation | n•n0= 2 | n•n = 2 | ∞•p = -1 | ||||
see note 2 at bottom of page 360 |
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