Even more so with the “No foo is a bar”. Those statements are most probably either very common definitions like “no mammal is a bird” and therefore not very informative, either they are improbable. Like “no man can live more than X minutes without oxygen, ever”.
In the last case, even if the X is huge, we can assume that maybe it can be done under some (unseen yet) circumstances.
In other words, don’t be too hasty with universal negations!
Even more so with the “No foo is a bar”. Those statements are most probably either very common definitions like “no mammal is a bird” and therefore not very informative, either they are improbable. Like “no man can live more than X minutes without oxygen, ever”.
In the last case, even if the X is huge, we can assume that maybe it can be done under some (unseen yet) circumstances.
In other words, don’t be too hasty with universal negations!