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0 or does not exist?

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**anonimnystefy****Real Member**- From: The Foundation
- Registered: 2011-05-23
- Posts: 15,822

Yes, it is 0. Why should it not exist?

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The knowledge of some things as a function of age is a delta function.

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**phanthanhtom****Member**- Registered: 2012-06-22
- Posts: 215

Yup. It is 0. Probably you mean there should be a sign (negative or positive) for infinity? Not needed in this case.

*Last edited by phanthanhtom (2013-06-16 02:25:18)*

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OK

∞ or does not exist?

'And fun? If maths is fun, then getting a tooth extraction is fun. A viral infection is fun. Rabies shots are fun.'

'God exists because Mathematics is consistent, and the devil exists because we cannot prove it'

'You have made another human being happy. There is no greater accomplishment.' -bobbym

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**bobbym****Administrator**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 92,361

Hi;

I would say ∞.

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**phanthanhtom****Member**- Registered: 2012-06-22
- Posts: 215

it is infinity.

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But isn't it different from different directions??

'And fun? If maths is fun, then getting a tooth extraction is fun. A viral infection is fun. Rabies shots are fun.'

'God exists because Mathematics is consistent, and the devil exists because we cannot prove it'

'You have made another human being happy. There is no greater accomplishment.' -bobbym

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**bobbym****Administrator**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 92,361

That is very good, I always forget that. You are correct. It is undefined.

**In mathematics, you don't understand things. You just get used to them.**

**I agree with you regarding the satisfaction and importance of actually computing some numbers. I can't tell you how often I see time and money wasted because someone didn't bother to run the numbers.**

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**{7/3}****Member**- Registered: 2013-02-11
- Posts: 210

The second limit does not exist,it would exist if absolute value was used.

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Or if the denominator was x[sup]2[/sup]

'God exists because Mathematics is consistent, and the devil exists because we cannot prove it'

'You have made another human being happy. There is no greater accomplishment.' -bobbym

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**bobbym****Administrator**- From: Bumpkinland
- Registered: 2009-04-12
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Then I would say it is infinity, because it has the same limit from both sides.

**In mathematics, you don't understand things. You just get used to them.**

**I agree with you regarding the satisfaction and importance of actually computing some numbers. I can't tell you how often I see time and money wasted because someone didn't bother to run the numbers.**

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Yes. I was adding an option to post 9 actually

'God exists because Mathematics is consistent, and the devil exists because we cannot prove it'

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**bobbym****Administrator**- From: Bumpkinland
- Registered: 2009-04-12
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Mathematica believes the first limit is infinity. Something about a projective plane...

**In mathematics, you don't understand things. You just get used to them.**

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OK but my কলনবিদ্যা (pronounced something like "Kalanbidya" meaning Calculus) book does not agree that #4 is infinity

'God exists because Mathematics is consistent, and the devil exists because we cannot prove it'

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**bobbym****Administrator**- From: Bumpkinland
- Registered: 2009-04-12
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Which one is number 4?

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**{7/3}****Member**- Registered: 2013-02-11
- Posts: 210

The limit would also exist,if it was one sided limit.

There are 10 kinds of people in the world,people who understand binary and people who don't.

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Agnishom wrote:

OK

∞ or does not exist?

This is number 4

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**bobbym****Administrator**- From: Bumpkinland
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Oh yes, I would say it is undefined. I was just mentioning that M does not agree. The Wiki page explains why but I do not understand.

**In mathematics, you don't understand things. You just get used to them.**

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Could you please provide a link?

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'You have made another human being happy. There is no greater accomplishment.' -bobbym

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**bobbym****Administrator**- From: Bumpkinland
- Registered: 2009-04-12
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http://en.wikipedia.org/wiki/Limit_of_a_function

It starts with this line:

In contrast, when working with the projective real line, infinities (much like 0) are unsigned, so, the central limit does exist in that context:

**In mathematics, you don't understand things. You just get used to them.**

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Which do you not understand?

'God exists because Mathematics is consistent, and the devil exists because we cannot prove it'

'You have made another human being happy. There is no greater accomplishment.' -bobbym

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**bobbym****Administrator**- From: Bumpkinland
- Registered: 2009-04-12
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The whole thing about why that limit now exists.

**In mathematics, you don't understand things. You just get used to them.**

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Does it exist?

'God exists because Mathematics is consistent, and the devil exists because we cannot prove it'

'You have made another human being happy. There is no greater accomplishment.' -bobbym

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**{7/3}****Member**- Registered: 2013-02-11
- Posts: 210

In projective space there are 2 points at infinity in any direction,since 2 lines intersect in one point and a parallel line intersects both points at infinity,the two points are considered same,thus in case of real projective line infinity and nagetive infinity are the same points and the limit is simply infinity(or minus infinity,doesn't matters cause they're same)

*Last edited by {7/3} (2013-06-16 16:38:01)*

There are 10 kinds of people in the world,people who understand binary and people who don't.

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