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  • $\begingroup$ All the people in the empty set have to follow the ruler's rules. To say that all the people a ruler rules, have to follow their rules, is more consistent with the sociological meaning than your version, where only one person need follow the ruler's rules. $\endgroup$
    – tkf
    Commented Jun 8 at 11:49
  • $\begingroup$ Your "only one" is not the same as my "at least one", and your "all the people in the empty set" equates to "no people", so I am not sure that you have addressed my concerns in any meaningful way. $\endgroup$
    – James Newton
    Commented Jun 8 at 13:11
  • $\begingroup$ "Only one" satisfies the requirement of "at least one" and sometimes "none" can be "all". All this comes very naturally to mathematicians, but you ask a valid question: Is it appropriate to use this language in the wider puzzling community? Both of us are new to the puzzling community (judging by our respective activity), but I would take the positive reception of the question as evidence that they are just as happy to accept the conventions of logic as mathematicians. $\endgroup$
    – tkf
    Commented Jun 9 at 0:56