| position | length | angle and ratio |
parallelism | cross- ratio |
neighbour- liness |
|
identity |
|
|
|
|
|
|
isometry |
|
|
|
|
|
|
similarity |
|
|
|
|
||
affinity |
|
|
|
|||
perspectivity |
|
|
||||
topology |
|
