13.16.15 Checking if four points form a harmonic division: is_harmonic
The is_harmonic command determines whether or not four
points form a harmonic division.
-
is_harmonic takes four arguments:
P,Q,R,S, four points.
- is_harmonic(P,Q,R,S) returns 1 if P,Q,R and S form a
harmonic range and returns 0 otherwise.
Examples.
-
Input:
is_harmonic(0,2,3/2,3)
Output:
- Input:
is_harmonic(0,1+i,1,i)
Output: