Birkhoff's theorem is a very useful result in General Relativity,…

https://www.physicsforums.com/insights/wp-content/uploads/2015/08/birktheo.png135240PeterDonishttps://www.physicsforums.com/insights/wp-content/uploads/2016/08/PF_Insightsnew.pngPeterDonis2015-08-18 13:32:392018-06-29 17:41:52A Short Proof of Birkhoff's Theorem