>>>>> "DM" == Duncan Murdoch <murdoch.dun...@gmail.com> >>>>> on Sat, 12 Dec 2015 09:05:04 -0500 writes:
DM> On 12/12/2015 8:44 AM, peter dalgaard wrote: >> >>> On 12 Dec 2015, at 10:54 , Martin Maechler >>> <maech...@stat.math.ethz.ch> wrote: >>> >>> My conclusion: Breaking such a fundamental lemma of >>> logic as "the empty set is always true" >> >> Umm, that doesn't make sense to me. Surely you mean that >> "an AND-operation over an empty index set is TRUE"? A >> similar OR operation is FALSE, i.e. they behave like >> empty products and sums, respectively. >> DM> How about "the empty set is all true, and all false." or, what the I *meant* with the above: "All statements about elements of the empty set are true" ((and I still like the short form, even though it is not correct strictly logically/mathematically)) Of course, Peter is correct, and that any(logical(0)) is FALSE is really the only sensical way. ______________________________________________ R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.