Discussion about math, puzzles, games and fun. Useful symbols: ÷ × ½ √ ∞ ≠ ≤ ≥ ≈ ⇒ ± ∈ Δ θ ∴ ∑ ∫ π -¹ ² ³ °

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**JaneFairfax****Member**- Registered: 2007-02-23
- Posts: 6,868

There are three common ways to represent the arithmetic operation of multiplication:

(i) by the cross symbol × (often called times):

(ii) by a dot:

(iii) by nothing:

The last method is not suitable for raw numerals 0, 1, 2 etc

is generally interpreted as the single number twenty-three rather than the operation two times three. The best multiplication symbol to use for numerals is the cross symbol.If you use a dot with numerals to represent multiplication, make sure you use a centre dot rather than a baseline dot. In LaTeX, it should be formatted with the \cdot command. **Do not use the baseline dot for multiplication that represents a decimal point!!**

*Last edited by JaneFairfax (2009-01-25 02:06:51)*

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**ganesh****Moderator**- Registered: 2005-06-28
- Posts: 20,165

JaneFairfax,

Thanks for the post. I had learnt of this immediately on seeing your reply to the puzzle being referred. I thought that was the end of it.

It is no good to try to stop knowledge from going forward. Ignorance is never better than knowledge - Enrico Fermi.

Nothing is better than reading and gaining more and more knowledge - Stephen William Hawking.

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**Ricky****Moderator**- Registered: 2005-12-04
- Posts: 3,791

It is also typical for a baseline dot to mean the dot product. But I'm not entirely sure why this is posted in Euler Avenue and not in response to the puzzle... But hey Jane, mistakes happen. Getting angry over something that can't be changed really does nothing but make it worse.

"In the real world, this would be a problem. But in mathematics, we can just define a place where this problem doesn't exist. So we'll go ahead and do that now..."

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**Identity****Member**- Registered: 2007-04-18
- Posts: 934

I prefer (2)(3) = 6, typically reserving

and for vectors.Offline

Who is the guy who refferenced this in the wikipedia?

'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'

I'm not crazy, my mother had me tested.

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**bobbym****Administrator**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 102,410

Hi;

What is wrong with the comments given above?

**In mathematics, you don't understand things. You just get used to them.****If it ain't broke, fix it until it is.** **A number by itself is useful, but it is far more useful to know how accurate or certain that number is.**

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nothing

'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'

I'm not crazy, my mother had me tested.

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**bobbym****Administrator**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 102,410

I like the center dot given by \cdot best but \times does have its points.

**In mathematics, you don't understand things. You just get used to them.****If it ain't broke, fix it until it is.** **A number by itself is useful, but it is far more useful to know how accurate or certain that number is.**

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Agnishom wrote:

Who is the guy who refferenced this in the wikipedia?

'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'

I'm not crazy, my mother had me tested.

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**bobbym****Administrator**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 102,410

I am sorry, are you asking a question?

**In mathematics, you don't understand things. You just get used to them.****If it ain't broke, fix it until it is.** **A number by itself is useful, but it is far more useful to know how accurate or certain that number is.**

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I am talking about: http://en.wikipedia.org/wiki/Full_stop#cite_note-5

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

I'm not crazy, my mother had me tested.

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**bobbym****Administrator**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 102,410

Hooahh as the great Al Pacino would say! It does look like they have a link to this site.

**In mathematics, you don't understand things. You just get used to them.****If it ain't broke, fix it until it is.**

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and who put that?

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

I'm not crazy, my mother had me tested.

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**bobbym****Administrator**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 102,410

I do not know who did that.

**In mathematics, you don't understand things. You just get used to them.****If it ain't broke, fix it until it is.**

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The whole thread is kind of stupid

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

I'm not crazy, my mother had me tested.

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**bobbym****Administrator**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 102,410

This one or that one?

**In mathematics, you don't understand things. You just get used to them.****If it ain't broke, fix it until it is.**

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This one.

What is the other?

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

I'm not crazy, my mother had me tested.

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**bobbym****Administrator**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 102,410

Judging by what I can see it was an argument in another thread carried over to this one.

**In mathematics, you don't understand things. You just get used to them.****If it ain't broke, fix it until it is.**

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Where is it?

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

I'm not crazy, my mother had me tested.

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**bobbym****Administrator**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 102,410

I would assume it is in one of ganesh's threads of problems.

**In mathematics, you don't understand things. You just get used to them.****If it ain't broke, fix it until it is.**

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