Editing Escape velocity (section)

=== Relativistic ===
The same result is obtained by a [[Theory of relativity|relativistic]] calculation, in which case the variable ''r'' represents the ''radial coordinate'' or ''reduced circumference'' of the [[Schwarzschild metric]].<ref>{{Cite book |last1=Taylor |first1=Edwin F. |url=https://books.google.com/books?id=y_waLQAACAAJ |title=Exploring Black Holes: Introduction to General Relativity |last2=Wheeler |first2=John Archibald |last3=Bertschinger |first3=Edmund |publisher=Addison-Wesley |year=2010 |isbn=978-0-321-51286-4 |edition=2nd revised |pages=2–22}} [http://www.eftaylor.com/pub/chapter2.pdf Sample chapter, page 2-22] {{Webarchive|url=https://web.archive.org/web/20170721192815/http://www.eftaylor.com/pub/chapter2.pdf |date=21 July 2017 }}</ref><ref>{{Cite book |last=Choquet-Bruhat |first=Yvonne |url=https://books.google.com/books?id=rOYwBQAAQBAJ&pg=PA116 |title=Introduction to General Relativity, Black Holes, and Cosmology |publisher=[[Oxford University Press]] |year=2015 |isbn=978-0-19-966646-1 |edition=illustrated |pages=116–117}}</ref>