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 2009-08-30, 18:52 #1 Xyzzy     Aug 2002 32·929 Posts 50 replies This is just (another) silly idea to see how long it takes to get 50 unique members to post to a thread. The rules:Post an interesting math snippet, using the forum's math rendering engine. Watch the thread. Profit! You may only post once in this thread. If you post a second time it will be deleted. $\red\fs2 1\:+\:1\:=\:2$
 2009-08-30, 19:40 #2 frmky     Jul 2003 So Cal 222410 Posts $e^{i\pi}=-1$
 2009-08-30, 19:59 #3 Batalov     "Serge" Mar 2008 Phi(4,2^7658614+1)/2 2×3×7×229 Posts $B_m=\sum_{k=0}^m\sum_{v=0}^k(-1)^v {k \choose v} \frac{v^m}{k+1}$ Note: \binom doesn't work in your renderer!
 2009-08-30, 20:04 #4 10metreh     Nov 2008 232210 Posts IMO, this thread should be deleted.
 2009-08-30, 20:17 #5 WraithX     Mar 2006 2·35 Posts One of my favorites, 5 mathematical constants in one equation: $\blue\fs5 e^{(\pi*i)}\:+\:1\:=\:0$ And since that one is already taken, I've seen funny t-shirts like: $\green\fs5 \int_{10}^{13} 2x\,dx$ $\red\fs5 \int \frac{1}{cabin}\,dcabin = \log cabin$ Or, here's a dangerous one: $\blue\fs5 2^{\aleph_0} = \aleph_1$
 2009-08-30, 20:17 #6 Brian-E     "Brian" Jul 2007 The Netherlands 2·3·5·109 Posts $\left|\pi-\frac{355}{113}\right|<10^{-6}$ Last fiddled with by Brian-E on 2009-08-30 at 20:20
2009-08-30, 20:27   #7
bsquared

"Ben"
Feb 2007

1101111110112 Posts

Quote:
 Originally Posted by 10metreh IMO, this thread should be deleted.
Because there's no place for silliness in this world? Excellent point there. Allow me to not invite you out for drinks anytime soon

$y(x) = (ax +b)^2 - n$

2009-08-31, 01:38   #8
retina
Undefined

"The unspeakable one"
Jun 2006
My evil lair

2·23·137 Posts

Quote:
 Originally Posted by Xyzzy Post an interesting math snippet, using the forum's math rendering engine.
Note to others: This only works if you allow JS. I don't got any of that JS stuff so ...

a=b
a^2=ab
a^2-b^2=ab-b^2
(a+b)(a-b)=b(a-b)
a+b=b
2b=b
2=1

2009-08-31, 02:06   #9
mdettweiler
A Sunny Moo

Aug 2007
USA (GMT-5)

3·2,083 Posts

Quote:
 Originally Posted by retina Note to others: This only works if you allow JS. I don't got any of that JS stuff so ... a=b a^2=ab a^2-b^2=ab-b^2 (a+b)(a-b)=b(a-b) a+b=b 2b=b 2=1
Actually, you can still use the rendering engine; just enclose the text to be rendered in [tex] tags. That's all the little JS button does anyway. Heck, I rarely use the buttons anyway even though I have JS enabled.

As an example, here's your little snippet rendered with the rendering engine, without the help of any JS buttons.

$a=b$
$a^2=ab$
$a^2-b^2=ab-b^2$
$(a+b)(a-b)=b(a-b)$
$a+b=b$
$2b=b$
$2b=b$
$2=1$

One thing to note is that it seems you need to enclose each individual line of a multi-line selection, or else everything gets run together as one line.

 2009-08-31, 03:17 #10 Uncwilly 6809 > 6502     """"""""""""""""""" Aug 2003 101×103 Posts 1012110 Posts $\pi\neq4$
2009-08-31, 03:40   #11
davieddy

"Lucan"
Dec 2006
England

2×3×13×83 Posts

Quote:
 Originally Posted by bsquared Because there's no place for silliness in this world? Excellent point there. Allow me to not invite you out for drinks anytime soon
I endorse this sentiment. It gives me a reason to be cheerful
for living at the end of Buckinghamshire opposite to the Chilterns.

It only just occurred to me that the largest signed 32bit integer
is a famous Mersenne prime.

$Cheers!$

Last fiddled with by davieddy on 2009-08-31 at 04:01

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