Talk:exception that proves the rule
I believe that the Latin here is misunderstood (and that the same misunderstanding occurred as this phrase first passed into English). Probat in Latin can mean "tests"; I am not at all sure it can mean "proves" in the sense given here. - Jmabel 16:55, 21 February 2008 (UTC)
The examples given are false assumptions. From a mathmatical view, "Parking on Sunday is free." does not imply that parking on other weekdays is not free. It just stands for itself and only defines that parking on sunday is free. Same for the second example.
I also agree to the writing before me, that its tests not confirms. A common translation error.