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

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#1 2005-06-26 19:48:05

MathsIsFun
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Registered: 2005-01-21
Posts: 7,630

Math Symbols

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

ƒ(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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#2 2005-06-27 01:28:30

ryudo2005
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Registered: 2005-06-27
Posts: 2

Re: Math Symbols

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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#3 2005-06-27 01:29:57

MathsIsFun
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Registered: 2005-01-21
Posts: 7,630

Re: Math Symbols

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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#4 2005-06-27 03:24:23

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

Re: Math Symbols

They look good as decorative items, too! smile


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

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#5 2005-06-27 04:25:39

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

Re: Math Symbols

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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#6 2005-06-27 18:49:42

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

Re: Math Symbols

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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#7 2005-06-27 20:35:57

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

Re: Math Symbols

√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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#8 2005-06-27 21:17:37

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

Re: Math Symbols

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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#9 2005-06-27 21:46:47

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

Re: Math Symbols

I prefer lambda and mu.


Why did the vector cross the road?
It wanted to be normal.

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#10 2005-06-28 03:08:31

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

Re: Math Symbols

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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#11 2005-06-28 03:55:34

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

Re: Math Symbols

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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#12 2005-06-28 04:29:06

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

Re: Math Symbols

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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#13 2005-06-28 06:30:06

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

Re: Math Symbols

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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#14 2005-06-28 07:50:04

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

Re: Math Symbols

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


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

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#15 2005-06-28 07:51:15

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

Re: Math Symbols

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 big_smile
I bought a large popcorn @ the cinema the other day, it was pretty big...some might even say it was "large
cool Fatboy Slim is a Legend cool

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#16 2005-06-28 07:53:01

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

Re: Math Symbols

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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#17 2006-03-31 15:23:58

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

Re: Math Symbols

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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#18 2016-05-09 15:58:53

Monox D. I-Fly
Member
Registered: 2015-12-02
Posts: 670

Re: Math Symbols

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
?

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#19 2016-05-09 16:14:33

bobbym
Administrator
From: Bumpkinland
Registered: 2009-04-12
Posts: 106,389

Re: Math Symbols

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.
No great discovery was ever made without a bold guess.

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#20 2016-05-09 16:29:57

Monox D. I-Fly
Member
Registered: 2015-12-02
Posts: 670

Re: Math Symbols

What about the other \var codes?

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#21 2016-05-09 18:27:47

bobbym
Administrator
From: Bumpkinland
Registered: 2009-04-12
Posts: 106,389

Re: Math Symbols

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.
No great discovery was ever made without a bold guess.

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#22 2016-05-11 15:23:32

Monox D. I-Fly
Member
Registered: 2015-12-02
Posts: 670

Re: Math Symbols

And

?

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#23 2016-05-11 15:43:49

bobbym
Administrator
From: Bumpkinland
Registered: 2009-04-12
Posts: 106,389

Re: Math Symbols

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.
No great discovery was ever made without a bold guess.

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#24 2016-05-21 23:52:22

zetafunc
Member
Registered: 2014-05-21
Posts: 1,625
Website

Re: Math Symbols

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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