[R] stopifnot with logical(0)

[Duncan Murdoch]

On 12/12/2015 8:44 AM, peter dalgaard wrote:
>
>> On 12 Dec 2015, at 10:54 , Martin Maechler <maechler at 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.
>

How about "the empty set is all true, and all false."