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Old 2009-08-30, 18:52   #1
Xyzzy
 
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"Mike"
Aug 2002

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Question 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:
  1. Post an interesting math snippet, using the forum's math rendering engine.
  2. Watch the thread.
  3. Profit!
You may only post once in this thread. If you post a second time it will be deleted.

\red\fs2 1\:+\:1\:=\:2
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Old 2009-08-30, 19:40   #2
frmky
 
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e^{i\pi}=-1
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Old 2009-08-30, 19:59   #3
Batalov
 
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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!
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Old 2009-08-30, 20:04   #4
10metreh
 
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IMO, this thread should be deleted.
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Old 2009-08-30, 20:17   #5
WraithX
 
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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
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Old 2009-08-30, 20:17   #6
Brian-E
 
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\left|\pi-\frac{355}{113}\right|<10^{-6}<br />

Last fiddled with by Brian-E on 2009-08-30 at 20:20
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Old 2009-08-30, 20:27   #7
bsquared
 
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Feb 2007

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Quote:
Originally Posted by 10metreh View Post
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
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Old 2009-08-31, 01:38   #8
retina
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Quote:
Originally Posted by Xyzzy View Post
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
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Old 2009-08-31, 02:06   #9
mdettweiler
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Quote:
Originally Posted by retina View Post
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.
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Old 2009-08-31, 03:17   #10
Uncwilly
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\pi\neq4
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Old 2009-08-31, 03:40   #11
davieddy
 
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"Lucan"
Dec 2006
England

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Quote:
Originally Posted by bsquared View Post
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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