13.16.16 Checking if lines are in a bundle: is_harmonic_line_bundle
The is_harmonic_line_bundle command determines how lines
are related.
-
is_harmonic_line_bundle takes one argument:
L, a list or sequence of lines.
- is_harmonic_line_bundle(L) returns:
-
1 if the lines pass through a common point
- 2 if the lines are parallel
- 3 if the lines are the same
- 0 otherwise
Example.
Input:
is_harmonic_line_bundle([line(0,1+i),line(0,2+i),line(0,3+i),line(0,1)])
Output: