Emmy Noether’s Wonderful Theorem

http://www.springerlink.com/content/m500g70515681003/fulltext.pdf

[1]http://dx.doi.org/10.1063/PT.3.1263

 

48p

In constrast to Hamilton's principle, relativistic mechanics postulates that, of all world lines through spacetime that a freely falling particle might follow from even A to even ZB, the world line actually followed is the one for which the elapsed proper time is a maximum. Let us call