|WikiProject Mathematics||(Rated Start-class, Low-priority)|
Please, can somebody create an image for this - I cannot understand this stub so far. 22.214.171.124 16:09, 24 June 2007 (UTC)
Drawing the diagram suggested just seems to make a regular parallel line to me. I have just come across the term antiparallel (in a physics text) used to describe a vector which is parallel to an axis but in the opposite sense. So perhaps antiparallel means something like this: if two vectors (or arrows or lines with direction) are parallel but in opposing senses then they are antiparallel. For example a left-to-right arrow is antiparallel to a right-to-left arrow. AP.