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2 years ago  ::  Oct 06, 2011 - 2:27PM #1
homicidal_squirrel
Date Joined: Jul 17, 2007
Posts: 20,495
Does 0.999(repeating1) = 1?

Why?


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2 years ago  ::  Oct 06, 2011 - 2:31PM #2
dirtyfrank
Date Joined: Sep 8, 2007
Posts: 24,233
Yes and no. Depends on how you look at it, what you need it for and what theory you use to analyze it.

In general though it's equal to 1. In most cases.

But at the same time it is infinity smaller than 1 as well.
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2 years ago  ::  Oct 06, 2011 - 2:37PM #3
Resurrection_Man
Date Joined: Jun 7, 2011
Posts: 9,530
This is orwellian logic! 0.9 is 0.9, not 1.

Might as well say 2+2=5.

I swear. After newspeak we have newcalculus?
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2 years ago  ::  Oct 06, 2011 - 2:42PM #4
dirtyfrank
Date Joined: Sep 8, 2007
Posts: 24,233
He's not talking about 0.9. He's talking about 0.99999999999999999999999999999999999999999999999-
99999999999999999999999999999999999999999999999999999999999999999999999999999999999999-
99999999999999999999999999999999999999999999999999999999999999999999999999999999999999-
99999999999999999999999999999999999999999999999999999999999999999999999999999999999999-
99999999999999999999999999999999999999999999999999999999999999999999999999999999999999-
99999999999999999999999999999999999999999999999999999999999999999999999999999999999999-
99999999999999999999999999999999999999999999999999999999999999999999999999999999999999-
99999999999999999999999999999999999999999999999999999999999999999999999999999999999999-
99999999999999999999999999999999999999999999999999999999999999999999999999999999999999-
99999999999999999999999999999999999999999999999999999999999999999999999999999999999999-
99999999999999999999999999999999999999999999999999999999999999999999999999999999999999-
99999999999999999999999999999999999999999999999999999999999999999999999999999999999999-
99999999999999999999999999999999999999999999999999999999999999999999999999999999999999-
99999999999999999999999999999999999999999999999999999999999999999999999999999999999999-
99999999999999999999999999999999999999999999999999999999999999999999999999999999999999-
99999999999999999999999999999999999999999999999999999999999999999999999999999999999999-
99999999999999999999999999999999999999999999999999999999999999999999999999999999999999-
99999999999999999999999999999999999999999999999999999999999999999999999999999999999999-
99999999999999999999999999999999999999999999999999999999999999999999999999999999999999-
99999999999999999999999999999999999999999999999999999999999999999999999999999999999999-
99999999999999999999999999999999999999999999999999999999999999999999999999999999999999-
99999999999999999999999999999999999999999999999999999999999999999999999999999999999999-
99999999999999999999999999999999999999999999999999999999999999999999999999999999999999-
99999999999999999999999999999999999999999999999999999999999999999999999999999999999999-
99999999999999999999999999999999999999999999999999999999999999999999999..... so on and so forth.

and well I think you get the idea. Hopefully.
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2 years ago  ::  Oct 06, 2011 - 2:44PM #5
Resurrection_Man
Date Joined: Jun 7, 2011
Posts: 9,530
0.99999999999999999999999999999999999999999999999-
99999999999999999999999999999999999999999999999999999999999999999999999999999999999999-
99999999999999999999999999999999999999999999999999999999999999999999999999999999999999-
99999999999999999999999999999999999999999999999999999999999999999999999999999999999999-
99999999999999999999999999999999999999999999999999999999999999999999999999999999999999-
99999999999999999999999999999999999999999999999999999999999999999999999999999999999999-
99999999999999999999999999999999999999999999999999999999999999999999999999999999999999-
99999999999999999999999999999999999999999999999999999999999999999999999999999999999999-
99999999999999999999999999999999999999999999999999999999999999999999999999999999999999-
99999999999999999999999999999999999999999999999999999999999999999999999999999999999999-
99999999999999999999999999999999999999999999999999999999999999999999999999999999999999-
99999999999999999999999999999999999999999999999999999999999999999999999999999999999999-
99999999999999999999999999999999999999999999999999999999999999999999999999999999999999-
99999999999999999999999999999999999999999999999999999999999999999999999999999999999999-
99999999999999999999999999999999999999999999999999999999999999999999999999999999999999-
99999999999999999999999999999999999999999999999999999999999999999999999999999999999999-
99999999999999999999999999999999999999999999999999999999999999999999999999999999999999-
99999999999999999999999999999999999999999999999999999999999999999999999999999999999999-
99999999999999999999999999999999999999999999999999999999999999999999999999999999999999-
99999999999999999999999999999999999999999999999999999999999999999999999999999999999999-
99999999999999999999999999999999999999999999999999999999999999999999999999999999999999-
99999999999999999999999999999999999999999999999999999999999999999999999999999999999999-
99999999999999999999999999999999999999999999999999999999999999999999999999999999999999-
99999999999999999999999999999999999999999999999999999999999999999999999999999999999999-
99999999999999999999999999999999999999999999999999999999999999999999999

is

0.99999999999999999999999999999999999999999999999-
99999999999999999999999999999999999999999999999999999999999999999999999999999999999999-
99999999999999999999999999999999999999999999999999999999999999999999999999999999999999-
99999999999999999999999999999999999999999999999999999999999999999999999999999999999999-
99999999999999999999999999999999999999999999999999999999999999999999999999999999999999-
99999999999999999999999999999999999999999999999999999999999999999999999999999999999999-
99999999999999999999999999999999999999999999999999999999999999999999999999999999999999-
99999999999999999999999999999999999999999999999999999999999999999999999999999999999999-
99999999999999999999999999999999999999999999999999999999999999999999999999999999999999-
99999999999999999999999999999999999999999999999999999999999999999999999999999999999999-
99999999999999999999999999999999999999999999999999999999999999999999999999999999999999-
99999999999999999999999999999999999999999999999999999999999999999999999999999999999999-
99999999999999999999999999999999999999999999999999999999999999999999999999999999999999-
99999999999999999999999999999999999999999999999999999999999999999999999999999999999999-
99999999999999999999999999999999999999999999999999999999999999999999999999999999999999-
99999999999999999999999999999999999999999999999999999999999999999999999999999999999999-
99999999999999999999999999999999999999999999999999999999999999999999999999999999999999-
99999999999999999999999999999999999999999999999999999999999999999999999999999999999999-
99999999999999999999999999999999999999999999999999999999999999999999999999999999999999-
99999999999999999999999999999999999999999999999999999999999999999999999999999999999999-
99999999999999999999999999999999999999999999999999999999999999999999999999999999999999-
99999999999999999999999999999999999999999999999999999999999999999999999999999999999999-
99999999999999999999999999999999999999999999999999999999999999999999999999999999999999-
99999999999999999999999999999999999999999999999999999999999999999999999999999999999999-
99999999999999999999999999999999999999999999999999999999999999999999999

not 1.

They got to you to?
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2 years ago  ::  Oct 06, 2011 - 3:08PM #6
Mr_Miscellany
Date Joined: Apr 5, 2007
Posts: 2,529

Oct 6, 2011 -- 2:27PM, homicidal_squirrel wrote:

Does 0.999(repeating1) = 1?

Why?


If you need accuracy out to 2,096 places (about what Dirty Frank wrote), then no, it doesn't equal 1.

If you don't need accuracy out that far, then yeah, for all practical purposes it equals 1.

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2 years ago  ::  Oct 06, 2011 - 3:32PM #7
Pluisjen
Date Joined: May 13, 2009
Posts: 14,168
I'll just drop the proof that they're equal here. I'll leave the proof that they're not equal for someone else. They both exist as far as I know, considering it's an open problem in mathematics.

0.999-> = X
multiply by 10
9.999-> = 10X
substract X
9 = 9X
divide by 9
1 = X

Ergo, 0.999-> = 1

Things get wonky when you start working with infinity and infinitely long numbers. There's a reason mathematicians have been murdered in ages past for suggesting that such a thing as "irrational numbers" existed.
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2 years ago  ::  Oct 06, 2011 - 3:53PM #8
draco1119
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Date Joined: Sep 25, 2005
Posts: 12,974

Oct 6, 2011 -- 2:27PM, homicidal_squirrel wrote:

Does 0.999(repeating1) = 1?

Why?



I see what you did here... 

Here's why I would say it equals 1: how, exactly, can you put a 1 after an infinite number of zeros?

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2 years ago  ::  Oct 06, 2011 - 5:49PM #9
GobbleDankster
Date Joined: Nov 10, 2008
Posts: 533
.999 does not equal 1
.999 to infinity still does not equal 1
Only 1 can = 1

My God!
Are you all morons?!
It's math! Math can't lie! In math, something is either equal, or it is not equal. There are no degrees of equal.


What the hell is going on here?!!?
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2 years ago  ::  Oct 06, 2011 - 6:08PM #10
bone_naga
Date Joined: Aug 30, 2007
Posts: 9,966

Oct 6, 2011 -- 3:32PM, Pluisjen wrote:

I'll just drop the proof that they're equal here. I'll leave the proof that they're not equal for someone else. They both exist as far as I know, considering it's an open problem in mathematics.

0.999-> = X
multiply by 10
9.999-> = 10X
substract X
9 = 9X
divide by 9
1 = X

Ergo, 0.999-> = 1

Things get wonky when you start working with infinity and infinitely long numbers. There's a reason mathematicians have been murdered in ages past for suggesting that such a thing as "irrational numbers" existed.



What? No! That's not how math works!

If you subtracted x you would get

9.999 - X = 9X

Basic algebra, whatever changes you apply to one side of the equal sign must also be applied to the other side.

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