{{page>wiki:headers:hheader}}

===== Spacetime Intervals =====

(Lecture: 5 minutes)

    * Timelike
    * Spacelike
    * Lightlike

See (ss)[[gsr>book:gsr:spacetime|5.3]].

==== Reflections ====

This short lecture provides a physical interpretation of the fact that
"(squared) distances" can now be positive, negative or zero, in terms of
space, time, and light, respectively.

{{page>wiki:footers:courses:rffooter}}