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(I wonder if he knows about lemmy)1 divided by 0 (a 3rd grade teacher and principal got it wrong), Reddit r/NoStupidQuestions [4:51 | Dec 02 2023 | bprp precalculus] (www.youtube.com)

submitted 9 months ago by [email protected] to c/[email protected]

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[–] [email protected] 0 points 9 months ago (1 children)

We do have a concept of limits in math. That doesn't mean we ignore it. It is just more correct not to divide by zero as the limits from either side do not converge. Or would you allow -inf as an answer aswell? That is the answer if we approach the limit from the other side.

It is not only convenience but rigor that dictates dividing by 0 to be an erroneus assumption.

[–] [email protected] 0 points 9 months ago* (last edited 9 months ago) (1 children)

Infinite, just like 0, actually has no - or +. So yes and no. For all intents and purposes -inf == inf.

[–] [email protected] 0 points 9 months ago (1 children)

This is completely wrong, please don't listen to this person.

[–] [email protected] 0 points 9 months ago (1 children)

I suggest you Google "Projectively Extended Real Numbers".

[–] [email protected] 0 points 9 months ago

You mean this one?

The projectively extended real number line is distinct from the affinely extended real number line, in which +∞ and −∞ are distinct.

Now tell me, do we usually work with the projectively extended real numbers?