# Trajectory Triangulation

#### MathematicalPhysicist

Gold Member
http://www.faculty.idc.ac.il/avidan/Traj-Trian-Pami.pdf

i havent finished reading (so perhaps it explained in further pages) and i encoutered to words 3D line.
now i presume D represents dimension so the next question is how can a line be a 3d if it's by definition is 1d?

perhaps it something with the terminology of the computer science any way what do you think?

#### MathematicalPhysicist

Gold Member
this T.T has connection to projective geometry. interesting...

#### MathematicalPhysicist

Gold Member
in page 3 it discuss about plucker coordinates and it states L(represents the line of intersection of the other lines you should read it, it's hard to explain))=P ^ Q
and it's have 4 coordinates wich is weird because they are discussing the trajectory of 3d line and not of a 4d so how can it be?

btw i think i have understood what they meant by 3d line the trajectory is in 3d not line itself.

"Trajectory Triangulation"

### Physics Forums Values

We Value Quality
• Topics based on mainstream science
• Proper English grammar and spelling
We Value Civility
• Positive and compassionate attitudes
• Patience while debating
We Value Productivity
• Disciplined to remain on-topic
• Recognition of own weaknesses
• Solo and co-op problem solving