## SheldonEinstein Group Title Can we say that : infinity = infinity ? one year ago one year ago

1. estudier Group Title

infinity is not a number

2. SheldonEinstein Group Title

$\large{\frac{2}{0} =\frac{1}{0} = \infty }$

3. estudier Group Title

U may talk about the cardinality of some set being equal to that of some other set.

4. estudier Group Title

2/0 and 1/0 are not defined (because infinity is not a number)

5. SheldonEinstein Group Title

then what is infinity sir?

6. estudier Group Title

Whatever u define it as (provided that definition does not create inconsistency)

7. SheldonEinstein Group Title

Wikipedia says : it can be often referred to as number but it is not exactly a number like real numbers.

8. estudier Group Title

Infinity is not a number.

9. SheldonEinstein Group Title

OK, got it now! Thanks @estudier sir and @nincompoop

10. estudier Group Title

yw

11. SheldonEinstein Group Title

I always do, I wonder is there anything real in this world? Or all are just imaginary.. Do 1 exist ? Do 2 exist? :)

12. estudier Group Title

Philosophy forum --->

13. SheldonEinstein Group Title

That was only comment sir, no discussion is likely to be carried on here on that comment. Thanks!

14. estudier Group Title

What mathematics does (in the usual model) is to posit (stipulate) the existence of an infinite set (the natural numbers). Then all the other infinite sets used by mathematics follow on from that axiom.

15. ParthKohli Group Title

No, infinity is not a number. And 1/0 is not infinity.

16. SheldonEinstein Group Title

Short and sweet ^

17. ParthKohli Group Title

Thanks Shelly.

18. SheldonEinstein Group Title

:)

19. estudier Group Title

Once upon a time, maths and physics were the same subject....

20. UnkleRhaukus Group Title

Aleph number $\large\aleph$