{{page>wiki:headers:hheader}} ===== Proper Time ===== (Lecture: 20 minutes) See (ss)[[gsr>book:gsr:proper|9.1]] of [[gsr>|the text]]. ==== Reflections ==== Make sure to draw a geometric representation of these algebraic identities, namely a right triangle whose legs are //dx// and //c dt//, and whose hypotenuse is c dτ. {{page>wiki:footers:courses:rffooter}}