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[–] Opieswife ago 

Lol thanks I also struggle sometimes with explaining what is in my head.

So sounds to me like this person's definition of zero is when we are referring to something specific like there are zero eggs but nothing is perhaps more general or more encompassing and doesn't refer to anything specific. Nothing means not only are there no eggs but there literally are no other things. Sounds silly but I believe that is what he means.

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[–] VIP740 0 points 1 point (+1|-0) ago 

Well, let's say we graph the formula y=√(r2-x2). And let's also say we only want real numbers. There will be values for x where y doesn't have a value.