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

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**MathsIsFun****Administrator**- Registered: 2005-01-21
- Posts: 7,656

I put a few maths symbols in the description up top. You should be able to drag your mouse across one, then copy and paste it into the post like this:

√4 = 2

2 ≠ 3

2² = 4

³√(27) = 3

(x) = x³

θ = 20°

Hope this looks and works fine for everyone.

"The physicists defer only to mathematicians, and the mathematicians defer only to God ..." - Leon M. Lederman

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**ryudo2005****Member**- Registered: 2005-06-27
- Posts: 2

I know this is math sybols but do you its too diffcult for me to understand. can you make it more easy like +or-.but its very interesting.

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**MathsIsFun****Administrator**- Registered: 2005-01-21
- Posts: 7,656

So, ryudo, what are you studying in math at the moment?

I have to go now, but if you reply here, I will see it later and reply to you - so be sure to check back in a day or so.

Bye for now.

"The physicists defer only to mathematicians, and the mathematicians defer only to God ..." - Leon M. Lederman

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**Roraborealis****Member**- Registered: 2005-03-17
- Posts: 1,594

They look good as decorative items, too!

School is practice for the future. Practice makes perfect. But - nobody's perfect, so why practice?

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**mathsyperson****Moderator**- Registered: 2005-06-22
- Posts: 4,900

That is amazingly useful.

∫3x² dx=x³+c

Sorry, felt like trying it out...

*Last edited by mathsyperson (2005-06-28 08:31:34)*

Why did the vector cross the road?

It wanted to be normal.

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**Roraborealis****Member**- Registered: 2005-03-17
- Posts: 1,594

2 ÷ 1 = 2

½ × 2 = 1

θ = theta (I think)

Oh, no! What does this one mean? ±

School is practice for the future. Practice makes perfect. But - nobody's perfect, so why practice?

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**mathsyperson****Moderator**- Registered: 2005-06-22
- Posts: 4,900

√4=±2.

Because 2² and (-2)² both=4

θ is indeed a greek letter called theta, usually used in maths for angles.

Why did the vector cross the road?

It wanted to be normal.

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**Zach****Member**- Registered: 2005-03-23
- Posts: 2,075

Theta drags. Omega is the best greek letter.

Boy let me tell you what:

I bet you didn't know it, but I'm a fiddle player too.

And if you'd care to take a dare, I'll make a bet with you.

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**mathsyperson****Moderator**- Registered: 2005-06-22
- Posts: 4,900

I prefer lambda and mu.

Why did the vector cross the road?

It wanted to be normal.

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**Roraborealis****Member**- Registered: 2005-03-17
- Posts: 1,594

I like Beta. And Gamma.

*Last edited by Roraborealis (2005-06-28 03:08:48)*

School is practice for the future. Practice makes perfect. But - nobody's perfect, so why practice?

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**mathsyperson****Moderator**- Registered: 2005-06-22
- Posts: 4,900

We obviously can't forget Pi, Phi and Psi.

Why did the vector cross the road?

It wanted to be normal.

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**Roraborealis****Member**- Registered: 2005-03-17
- Posts: 1,594

Yeah.....why did the greeks have to be so good at math?

School is practice for the future. Practice makes perfect. But - nobody's perfect, so why practice?

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**Zach****Member**- Registered: 2005-03-23
- Posts: 2,075

Because Greeks are cool?

Boy let me tell you what:

I bet you didn't know it, but I'm a fiddle player too.

And if you'd care to take a dare, I'll make a bet with you.

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**Roraborealis****Member**- Registered: 2005-03-17
- Posts: 1,594

I suppose so. I had a Greek maths teacher, and she was really really nice!

School is practice for the future. Practice makes perfect. But - nobody's perfect, so why practice?

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**Mr T****Member**- Registered: 2005-03-30
- Posts: 1,012

my only greek teacher was mr kokinos and he taught music. my god he was a freak

I come back stronger than a powered-up Pac-Man

I bought a large popcorn @ the cinema the other day, it was pretty big...some might even say it was "large

Fatboy Slim is a Legend

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**Roraborealis****Member**- Registered: 2005-03-17
- Posts: 1,594

The teacher I was on about was called Miss Kotrubi.

School is practice for the future. Practice makes perfect. But - nobody's perfect, so why practice?

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**George,Y****Member**- Registered: 2006-03-12
- Posts: 1,306

π how to display the "e" --*e* **e**?

*Last edited by George,Y (2006-03-31 15:26:18)*

**X'(y-Xβ)=0**

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**Monox D. I-Fly****Member**- Registered: 2015-12-02
- Posts: 782

By the way, what is the difference between

and , and , and , and , as well as and ? And I am asking about their use in math. Also, is Golden Ratio or ?Offline

**bobbym****bumpkin**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 109,606

is the symbol for the golden ratio means a very very tiny value. You see this a lot in numerical analysis.

**In mathematics, you don't understand things. You just get used to them.****If it ain't broke, fix it until it is.**** Always satisfy the Prime Directive of getting the right answer above all else.**

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**Monox D. I-Fly****Member**- Registered: 2015-12-02
- Posts: 782

What about the other \var codes?

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**bobbym****bumpkin**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 109,606

angle variable.

**In mathematics, you don't understand things. You just get used to them.****If it ain't broke, fix it until it is.**** Always satisfy the Prime Directive of getting the right answer above all else.**

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**Monox D. I-Fly****Member**- Registered: 2015-12-02
- Posts: 782

And

?Offline

**bobbym****bumpkin**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 109,606

Sometimes it is used as a bound on Chebyshev functions.

**In mathematics, you don't understand things. You just get used to them.****If it ain't broke, fix it until it is.**** Always satisfy the Prime Directive of getting the right answer above all else.**

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Monox D. I-Fly wrote:

By the way, what is the difference between

and

I've seen both used in analysis texts and lecture notes, and is the writer's preference. They typically denote an arbitrary positive real number.

and

Theta is commonly used for angles and theta functions. \vartheta is commonly used to denote the first Chebyshev function (that's the summatory log function over the primes).

and

Pi is used for numerous things, commonly the ratio between a circle's circumference and diameter, but also things like the prime-counting function. The latter is sometimes seen in fluid mechanics texts, and I've also seen it in an analytic number theory paper.

and

I've seen the former used in a lot of physics texts, for density or some other physical quantity. It's sometimes used to define a metric or a representation in representation theory. I've personally never seen the latter outside of a physics text, but I'm sure some author has used it in their paper somewhere.

and

Golden ratio, totient function, amongst many other things. Commonly used to define maps in algebra too.

Also, is Golden Ratio

or ?

I've always used the latter to denote the golden ratio (and the Wiki page seems to define it using that symbol, too). I prefer to adopt the former for the totient function -- although I often use \varphi for homomorphisms.

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