possessives - Bayes' Theorem or Bayes's Theorem? (Similarly, Charles' Law or Charles's Law?)





When did it become correct to add an ‘s’ to a singular possessive already ending in ‘s’?
Which singular names ending in “s” form possessives with only a bare apostrophe?



Which one is correct?
I thought the latter would be correct but apparently the former is always used; why?


Edit:


Another (confusing) example: Charles'(s?) law




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