Mathe questions

  • #1

Main Question or Discussion Point

Is infinity - 1 still infinity. Also if 1\3 = .333... then wouldent 3\3not only = 1 but .999... as well?
 

Answers and Replies

  • #2
Moonbear
Staff Emeritus
Science Advisor
Gold Member
11,349
51
I suggest you wander over to the math forum and take a look at the threads answering this question there. The thread requesting an FAQ sticky will be the easiest place to look.
 
  • #3
1,058
6
I am not sure about the definition of the infinity question. But for the second part: If you have 1/3 = .3333....., then 1/.333333..... = 3, so 3/3 = [1/.333333.....] / [1/.333333.....] which equals 1
 
  • #4
16
0
keep in mind infinity is not a number, but a limit. You can come arbitrarily close to infinity, but you can never reach it.
 
  • #5
Gokul43201
Staff Emeritus
Science Advisor
Gold Member
6,987
14
Much as it pains me to do this, I will have to move this thread from GD to Math.
 
  • #6
Integral
Staff Emeritus
Science Advisor
Gold Member
7,184
55
You can come arbitrarily close to infinity, but you can never reach it.
Actually I don't think you can get close to it. No matter how big a number you choose, infinity it still infinitely "far" away.
 
  • #7
Gokul43201
Staff Emeritus
Science Advisor
Gold Member
6,987
14
BTruesdell07 said:
Is infinity - 1 still infinity.
Yes.
Also if 1\3 = .333... then wouldent 3\3not only = 1 but .999... as well?
Yes again.
 
  • #8
16
0
Integral said:
Actually I don't think you can get close to it. No matter how big a number you choose, infinity it still infinitely "far" away.
your definition is better :smile: I like to think of it in the following way:

let's say you have a=x/n . You can choose x to be the greatest number your imagination can muster (thus coming arbitrarily close to infinity). lim of a when n -> infinity will always be 0. So as you said, "infinity it still infinitely "far" away".
 
  • #9
mathwonk
Science Advisor
Homework Helper
10,745
921
is infinity a place? like oz?
 
  • #10
786
0
How many of these discussions do we have to have going on? Can't one of the moderators make a sticky and address this subject once and for all? Please.
 

Related Threads for: Mathe questions

  • Last Post
Replies
4
Views
2K
  • Last Post
Replies
1
Views
521
  • Last Post
Replies
3
Views
2K
  • Last Post
Replies
12
Views
2K
  • Last Post
Replies
11
Views
3K
  • Last Post
Replies
6
Views
6K
  • Last Post
Replies
11
Views
5K
  • Last Post
Replies
5
Views
3K
Top