ForumsThe Tavern0.999... = 1

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Talo
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Talo
945 posts
Nomad

A friend of mine brought this up, as it is a debate going on right now in the worlds of science and math. Basically, the argument is that a decimal fallowed by an infinite number of nines is actually equal to One.

The argument is simple in that:

1/3 = 0.333...
1/3 + 1/3 + 1/3 = 3/3 = 1
0.333... + 0.333... + 0.333... = 0.999...
1 = .999...

But this is all well and good for the world of Math. But science has proven a different logic, were they are not equal. My favorite example is that in science, one plus one is approximately two, due to the impurities of one. This expression basically is stating that having two halves put back together does not make it whole again.

So in my argument, I argue that if 0.999... is equal to 1, then 1 is equal to 2. I shall demonstrate using the same logic. I shall refer to an infinite amount of numbers using "..."

1 - 0.999... = 0.000...001
1 + 0.000...0001 = 1.00...001

Step 1: 0.999 = 1.000...001

0 + 0 = 0
0.000...001 + 0.000...001 = 0.000...002

Step 2: 0.000...001 + 0.000...001 = 0.000...002

2 / 1 = 2
0.000...002 / 0.000.001 = 2

Step 3: 1 = 2

  • 67 Replies
thelistman
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thelistman
1,416 posts
Shepherd

Step 1: 0.999 = 1.000...001

0 + 0 = 0
0.000...001 + 0.000...001 = 0.000...002

Step 2: 0.000...001 + 0.000...001 = 0.000...002

2 / 1 = 2
0.000...002 / 0.000.001 = 2

Step 3: 1 = 2


This logic is flawed because the 1.000000......0001 does not repeat forever. .999 repeating forever does in fact = 1 though.

I used to be a math major, and I probably could have explained it much better 4-5 years ago. But not anymore.

The_Masquerade
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The_Masquerade
140 posts
Nomad

But 0 does not equal 0.0001 and .999 does not equal one. That's what I need you to explain. If you asked me what the Definition of Documentation is, then I wouldn't say, "a document".

Craze77
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Craze77
813 posts
Peasant

Like I said before, they might be rounding it. Someone asked me when is math simple, it is almost simple for me. Math is my fav. subject.

The_Masquerade
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The_Masquerade
140 posts
Nomad

So 1.000 rounds to 1.001? I'm asking them to explain their theories, if you want simplicity, I suggest searching for it elsewhere, where there is no discussion about 0, and infinity.

thelistman
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thelistman
1,416 posts
Shepherd

@ The masquerade

.00000001 does not equal 0 because the zero's never repeat forever. Some time, the zeros have to stop to insert the 1. But .999999 repeating (the nines repeat forever) does equal 1.

Aaroniscool
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Aaroniscool
254 posts
Nomad

Wow...old thread. (Sorry about the random revive :P)

Well, there's one algebraic way to prove .999... can equal 1:

let's start it easy:

X = .99 99 99 99...

therefore:

10X = 9. 99 99 99 99...

I'll put those 2 equations together to make a simultaneous equation

/ X = .99 99 99 99...
\\ X = 9.99 99 99 99...

multiply both sides of the top equation by -1

/ -X = -.99 99 99 99...
\\10X = 9.99 99 99 99...

Use Elimination to make the final equation...

9X = 9

therefore:

X = 9/9 = 1

Pixie214
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Pixie214
5,838 posts
Peasant

Random revive as you said though I alost undestood what you said which is impressive. However the randomness outweighs the impressivness I'm afraid.

Aaroniscool
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Aaroniscool
254 posts
Nomad

Lol, sorry, when I was doing my algebra and found this concept of proving numbers with infinite decimals to be rational numbers, I thought of this thread...that's not too weird, is it? :P

Pixie214
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Pixie214
5,838 posts
Peasant

Of course not I was doing something similar the other day but couldn;t find this thread... actually I was putting slinkies down the up escalator but ut it all comes to infinity eh.

Sarthra21
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Sarthra21
1,078 posts
Nomad

If you have 0.99999999999999999999 and so forth, then it would be much easier to just say one. NOW: I would agree with 1=2 if one wasnt just one. More like, 1.9999999999999.

ShintetsuWA
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ShintetsuWA
3,176 posts
Nomad

But .999999 repeating (the nines repeat forever) does equal 1.


The two reasons contradict each other. If the "endless" chains of 9 repeat forever, how can it
all of a sudden turn into a whole number?

And that part about 9/9 = .9999999 = 1 is false. 8/9 is true, though. If you want to divide
nine 9 times, then you have 1 group. Simple as that, and no infinite 9's were involved.

It's like the gap between 3/10 and 4/10. 3 / 10 = .333 repeating, while 4/10 is just .4,
because adding a 0 to the 4 makes 40 / 10, and that makes 4. Just use MS Calc. So between
8/9 and 9/9 is a significant decimal jump that decides the whole number factor. The
difference between 8/9 and 9/9 is .11, so between the two numbers, the number is increased
by .11, turning the number into a whole number. The decimals are an uneven integer. That's
as simple as it can get.
Drace
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Drace
3,880 posts
Nomad

Rofl thats ridiculous. 1/3 is equal to 0.33333333333333333333333333333333333333333333333333333333333333333333333333333333333333333333333333333333333333333 ongoing forever.

0.33 being 1/3 is an approximation

The 1 = 2 makes no sense at all, rofl. Because 0.0000000000000002/0.0000000000001 is 2 then 1 = 2?

0.999 = 1.000...001


???
ShintetsuWA
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ShintetsuWA
3,176 posts
Nomad

He's confusing us Drace. I just made the whole thing shed light, so no worries. He doesn't
know what he's talking about XD

dudeguy45
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dudeguy45
2,917 posts
Peasant

NOT equivalent. its .999 does not equal 1

Moegreche
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Moegreche
3,826 posts
Duke

The world of math has been shown to have many inconsistencies. This particular problem is merely an artifact of our system of writing numbers. But it has been proven that there is no way to formally and completely axiomatize mathematics. The incompleteness of arithmetic is far more troubling than a simple limit function concept.

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