I have heard of this principle before, but how can we show that it is true?
Feb 20, 2007 #1 Terilien 140 0 I have heard of this principle before, but how can we show that it is true?
Special and General Relativity News on Phys.org Light and sound waves reveal negative pressure New qubit circuit enables quantum operations with higher accuracy Inspired by butterfly wings, researchers develop a soft, color-changing system for optical devices
Feb 21, 2007 #2 dextercioby Science Advisor Homework Helper Insights Author 13,309 2,433 Only by comparing it with the other known variational principles in relativity.