Le 15-07-30 10:35, Jellby (POV-Ray) a écrit :
> On 30/07/15, at 11:35, Warp wrote:
>>
>> (According to most English style guides, the possessive of proper names
>> should always use 's, even if the name ends in s. Thus it's for example
>> "workers' rights" but "Fitts's law".)
>>
>
> Unless the law is named after several people named "Fitt", I guess.
>

Last time I checked, proper names are always invariable. At least, they 
are in French, and as English borrowed many grammatical rules from 
French along with a few 1000s words, having that rule been identical 
would have a prety high probability.
You have the Fitt family and the Fitts family.

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