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?
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Feb 21, 2007 #2 dextercioby Science Advisor Homework Helper Insights Author 13,023 576 Only by comparing it with the other known variational principles in relativity.