## Search found 319 matches

- Sun Feb 12, 2012 7:18 am UTC
- Forum: Religious Wars
- Topic: Chess vs. Go Which is the better board game.
- Replies:
**55** - Views:
**27641**

### Re: Chess vs. Go Which is the better board game.

In Chess Life a few decades ago, a checker player played against a chess player; each set up their half of the board with their pieces and played by their rules. The checker player won, although the chess player has an unbeatable strategy.

- Sat Feb 11, 2012 8:20 am UTC
- Forum: Mathematics
- Topic: Largest 3 consecutive semi-primes?
- Replies:
**19** - Views:
**5614**

### Re: Largest 3 consecutive semi-primes?

tomtom2357 wrote:That is probably about as difficult as the twin prime problem, which has not been solved yet.

A new milestone has been reached, though: Terrence Tao recently proved that every odd number is the sum of at most five primes.

- Sat Feb 11, 2012 8:10 am UTC
- Forum: Science
- Topic: Formula for lunar phase?
- Replies:
**2** - Views:
**8543**

### Re: Formula for lunar phase?

If you're only interested in the day, a few simple algorithms are available at http://www.ben-daglish.net/moon.shtml A NASA website says: Algorithms used in predicting the phases of the Moon as well as eclipses are based on Jean Meeus' Astronomical Algorithms (Willmann-Bell, Inc., Richmond, 1998). Y...

- Fri Feb 10, 2012 7:45 am UTC
- Forum: Mathematics
- Topic: help with diophantine approximation.
- Replies:
**39** - Views:
**5770**

### Re: help with diophantine approximation.

Have you tried solving simpler problems, like maximizing

min ( <a><b>, 2<2a><2b> )

min ( <a><b>, 2<2a><2b>, 3<3a><3b> )

...

?

(I'm using <a> for your ||a||, since ||a||||b|| is nasty on the eyes ...)

min ( <a><b>, 2<2a><2b> )

min ( <a><b>, 2<2a><2b>, 3<3a><3b> )

...

?

(I'm using <a> for your ||a||, since ||a||||b|| is nasty on the eyes ...)

- Thu Feb 09, 2012 7:19 am UTC
- Forum: Your art and links
- Topic: Insult Generator
- Replies:
**19** - Views:
**10451**

### Re: Insult Generator

Are you always thinking of the right comeback twenty minutes too late? Do people always make fun of your duck in hoi sin sauce wrap or dole cheque? Well for quick, effective comebacks look no further... introducing: THE INSULT GENERATOR!!! Nice stupid algorithm , you lazy bastard . Mad-libs are not...

- Mon Feb 06, 2012 6:01 am UTC
- Forum: Mathematics
- Topic: A Probability Conundrum
- Replies:
**7** - Views:
**1247**

### Re: A Probability Conundrum

The mean sum is easy ... you take the expected value and multiply it by the number of cards: \left(1 \cdot {12\over56} + 2\cdot{8\over 56} + 3 \cdot {8\over 56} + \cdots + 6\cdot {8\over 56} + 7 \cdot {4\over 56}\right)\cdot 5 which is 125/7 (checked with Maple). (This works because I'm usin...

- Sat Feb 04, 2012 6:58 am UTC
- Forum: Logic Puzzles
- Topic: Overhanging dominoes
- Replies:
**9** - Views:
**4609**

### Re: Overhanging dominoes

Which brings us to our next problem: for each positive integer N, using exactly N tiles, what is the greatest amount of overhang that can be realized? That is, the single tile that overhangs the most, its amount of overhang is to be maximized among all stable arrangements of N tiles. A couple of ye...

- Wed Feb 01, 2012 6:26 am UTC
- Forum: Science
- Topic: How can I obtain hard-to-get papers?
- Replies:
**14** - Views:
**2213**

### Re: How can I obtain hard-to-get papers?

To the OP: If you post the journals you're looking for, you'll probably get lots of help.

- Wed Feb 01, 2012 6:24 am UTC
- Forum: Mathematics
- Topic: An interesting probability problem that I thought of
- Replies:
**5** - Views:
**1163**

### Re: An interesting probability problem that I thought of

314man wrote:The trend continues to be n / (n+1)!

Digression: There's a classical problem where you have to show that

[math]{1\over 2!} + {2 \over 3!} + {3 \over 4!} + \cdots + {n-1 \over n!} = 1 - {1\over n!},[/math]

which is usually done by induction. This is another proof of the same result.

- Tue Jan 31, 2012 7:15 am UTC
- Forum: Gaming
- Topic: Games you have programmed
- Replies:
**93** - Views:
**36451**

### Re: Games you have programmed

Dason wrote:Eh - I don't really care too much. I just thought you might want to update the link in case you were going to share that with other people.

Actually, I did that too. Thanks.

- Tue Jan 31, 2012 7:09 am UTC
- Forum: Religious Wars
- Topic: Admit it. Your first OS is your favorite.
- Replies:
**81** - Views:
**46835**

### Re: Admit it. Your first OS is your favorite.

First OS: Er ... what did the Timex/Sinclair 1000 run on?

Okay, maybe that one doesn't count. Next OS: DOS 3.3 (Apple IIc)

**Spoiler:**

Okay, maybe that one doesn't count. Next OS: DOS 3.3 (Apple IIc)

- Mon Jan 30, 2012 7:42 am UTC
- Forum: Computer Science
- Topic: Regular Expression for the following language
- Replies:
**6** - Views:
**2179**

### Re: Regular Expression for the following language

((a|b|c|d)*a(a|b|c|d)*a(a|b|c|d)*c(a|b|c|d)*c(a|b|c|d)*c(a|b|c|d)*c(a|b|c|d)*|...) (where "..." means "and done similarly for all other ordings of aacccc"), i.e., brute force, works but looks very messy.

- Mon Jan 30, 2012 7:29 am UTC
- Forum: Gaming
- Topic: Games you have programmed
- Replies:
**93** - Views:
**36451**

### Re: Games you have programmed

A one-player version of Kensington (which probably violates all sorts of copyright laws) ... http://www.public.asu.edu/~checkma/Kensington/ The AI isn't too good; I've tried to do the programming in Javascript. The link to the rules seems to be broken. Oh. Use the Wayback Machine then: http://web.a...

### Re: Astrology

I can never find my horoscope in the paper. You see, I'm a Cetus (the Whale).

- Sun Jan 29, 2012 7:25 am UTC
- Forum: Mathematics
- Topic: Favourite Erroneous "Proofs"
- Replies:
**194** - Views:
**40723**

### Re: Favourite Erroneous "Proofs"

AFAIK, this one is new:

-1 = det [-1] = | -1 | = abs(-1) = 1.

"Proof by confusion of notation."

-1 = det [-1] = | -1 | = abs(-1) = 1.

"Proof by confusion of notation."

- Sun Jan 29, 2012 7:21 am UTC
- Forum: Religious Wars
- Topic: Chess vs. Go Which is the better board game.
- Replies:
**55** - Views:
**27641**

### Re: Chess vs. Go Which is the better board game.

I couldn't get past the rules for determining who wins a game ... Placing captured pieces in open areas and counting? Really?

Of course, I learned Chess first ...

Of course, I learned Chess first ...

- Sun Jan 29, 2012 7:19 am UTC
- Forum: Gaming
- Topic: Games you have programmed
- Replies:
**93** - Views:
**36451**

### Re: Games you have programmed

A one-player version of Kensington (which probably violates all sorts of copyright laws) ... http://www.public.asu.edu/~checkma/Kensington/ The AI isn't too good; I've tried to do the programming in Javascript. I wrote a Win32 version of "Subway Shuffle". I had communicated with the author...

- Sat Jan 28, 2012 7:47 am UTC
- Forum: Religious Wars
- Topic: Chess vs. Go Which is the better board game.
- Replies:
**55** - Views:
**27641**

### Re: Chess vs. Go Which is the better board game.

What do you mean by "better"? BTW, in the 1980s, a lot of difficult Go positions were analyzed using Combinatorial Game Theory ... look for a book called Mathematical Go Endgames: Nightmares for the Professional Go Player by Berlecamp and Wolfe if you want the details. You might have bett...

- Sat Jan 28, 2012 7:46 am UTC
- Forum: Religious Wars
- Topic: Chess vs. Go Which is the better board game.
- Replies:
**55** - Views:
**27641**

### Re: Chess vs. Go Which is the better board game.

What do you mean by "better"?

BTW, in the 1980s, a lot of difficult Go positions were analyzed using Combinatorial Game Theory ... look for a book called Mathematical Go Endgames: Nightmares for the Professional Go Player by Berlecamp and Wolfe if you want the details.

BTW, in the 1980s, a lot of difficult Go positions were analyzed using Combinatorial Game Theory ... look for a book called Mathematical Go Endgames: Nightmares for the Professional Go Player by Berlecamp and Wolfe if you want the details.

- Fri Jan 27, 2012 4:58 am UTC
- Forum: News & Articles
- Topic: Obama attacks, defends bailouts.
- Replies:
**46** - Views:
**4732**

### Re: Obama attacks, defends bailouts.

Anyways, I don't think it's just racism that effects ridiculous criticism of Obama. I myself am too young to remember the Clinton administration in any useful detail, but my dad tells me that there was about as much ridiculous partisanship and obstructionism then. I mean hell, they impeached Clinto...

- Thu Jan 26, 2012 7:14 am UTC
- Forum: News & Articles
- Topic: Obama attacks, defends bailouts.
- Replies:
**46** - Views:
**4732**

### Re: Obama attacks, defends bailouts.

Iulus Cofield wrote:Here we go. I'll get the the milk duds and root beer.

Are you in your comfortable chair as well?

- Thu Jan 26, 2012 7:11 am UTC
- Forum: Mathematics
- Topic: Set-theoretic brain fart
- Replies:
**9** - Views:
**1982**

### Re: Set-theoretic brain fart

In my amateur opinion, I don't think the "large" in "large cardinal" means what you think it means. I mean, you already know that size is relative, so in some sense it can't. Besides, in any model of ZFC, the cardinals already go all the way up to the top. I don't believe that's...

- Tue Jan 24, 2012 6:49 am UTC
- Forum: General
- Topic: Anyone know what this font is?
- Replies:
**8** - Views:
**1577**

### Re: Anyone know what this font is?

What can I say? I'm a font freak! (And that's a useful website, even though this might be only the second time I've used it.)

- Tue Jan 24, 2012 6:35 am UTC
- Forum: Serious Business
- Topic: New (old) anti-piracy threats -- ACTA etc.
- Replies:
**10** - Views:
**8141**

### Re: A new (old) threat

According to ACTA, the person being charged with copyright violation would have to prove that their material does not violate copyright. This is the exact opposite of the rights guaranteed by the Bill of Rights (due process, "innocent until proven guilty", etc.). It is NOT constitutional....

- Tue Jan 24, 2012 6:30 am UTC
- Forum: Computer Science
- Topic: Ugh... fiendish CS proffs...
- Replies:
**26** - Views:
**4491**

### Re: Ugh... fiendish CS proffs...

jareds wrote:As originally posed, the problem is in Scheme, which has exact rationals.

Oh. Well, I was confused by the C code.

- Tue Jan 24, 2012 6:07 am UTC
- Forum: Individual XKCD Comic Threads
- Topic: 1007: "Sustainable"
- Replies:
**115** - Views:
**27021**

- Tue Jan 24, 2012 6:04 am UTC
- Forum: General
- Topic: Anyone know what this font is?
- Replies:
**8** - Views:
**1577**

### Re: Anyone know what this font is?

http://new.myfonts.com/WhatTheFont/ says that the name of the font is Confidential. (That's its name; it's not a confidential name.)

See http://new.myfonts.com/fonts/fontfont/f ... fidential/

See http://new.myfonts.com/fonts/fontfont/f ... fidential/

- Mon Jan 23, 2012 6:56 am UTC
- Forum: Serious Business
- Topic: New (old) anti-piracy threats -- ACTA etc.
- Replies:
**10** - Views:
**8141**

### Re: A new (old) threat

Could you add ACTA to the thread title? Thanks. I didn't really know what it was but heard it mentioned in the course of SOPA/PIPA discussions, and I've just started branching out to finding out other bullshit going on. I just looked around and I found one video from 2009 that explains why ACTA (An...

- Mon Jan 23, 2012 6:47 am UTC
- Forum: Individual XKCD Comic Threads
- Topic: 1007: "Sustainable"
- Replies:
**115** - Views:
**27021**

### Re: 1007: "Sustainable"

Did anyone else notice the levelling off between 2000 and 2008? Gee, it's almost as if ...

- Mon Jan 23, 2012 2:14 am UTC
- Forum: Computer Science
- Topic: Ugh... fiendish CS proffs...
- Replies:
**26** - Views:
**4491**

### Re: Ugh... fiendish CS proffs...

There's another nuance to this problem ... Since computers can't express 1/3 exactly (with floating point), [3, 1, 1/3] wouldn't turn out to be a geometric series, since 3 * (1/3) is highly unlikely to equal 1 exactly.

- Mon Jan 23, 2012 2:03 am UTC
- Forum: Mathematics
- Topic: A maths question is giving me some difficulty...
- Replies:
**12** - Views:
**2318**

### Re: A maths question is giving me some difficulty...

Does your helper get to share the Prize of Great Worth?

- Fri Jan 20, 2012 7:21 am UTC
- Forum: Mathematics
- Topic: New google statistic
- Replies:
**6** - Views:
**2369**

### Re: New google statistic

I don't shave when I shower. I'd get electrocuted.

- Fri Jan 20, 2012 7:19 am UTC
- Forum: Computer Science
- Topic: Ugh... fiendish CS proffs...
- Replies:
**26** - Views:
**4491**

### Re: Ugh... fiendish CS proffs...

Also, letterX's code crashes for the sequence [0, 0, 0, 0, ...]

- Thu Jan 19, 2012 6:35 am UTC
- Forum: Computer Science
- Topic: Pattern analysis
- Replies:
**5** - Views:
**1997**

### Re: Pattern analysis

Re-reading your original question, it looks like you are more interested in the "magic happens" step here of determining this simplest Turing machine (or some other representation of an algorithm) that would output the sequence. One (again theoretical) way would be to enumerate all Turing...

- Tue Jan 17, 2012 5:04 am UTC
- Forum: Religious Wars
- Topic: The Rise and Fall of Programming Languages in 2011
- Replies:
**20** - Views:
**8799**

### Re: The Rise and Fall of Programming Languages in 2011

Interesting that C++ took a nosedive around 2005 ... That was about when some of the standards were changed (including the addition of namespaces). Um, no? The first standard was published in 1998 (including namespaces), and the second in 2011. There was a revision around 2003 but those were only m...

- Tue Jan 17, 2012 5:00 am UTC
- Forum: Mathematics
- Topic: Nonstandard proofs for simple theorems
- Replies:
**34** - Views:
**6500**

### Re: Nonstandard proofs for simple theorems

(I assume that other theorem are allowed here.)

How about Fürstenberg's proof of the infinitude of primes?

http://en.wikipedia.org/wiki/F%C3%BCrst ... _of_primes

(or http://www.cut-the-knot.org/proofs/Furstenberg.shtml , since Wikipedia is going away in a day or so.)

How about Fürstenberg's proof of the infinitude of primes?

http://en.wikipedia.org/wiki/F%C3%BCrst ... _of_primes

(or http://www.cut-the-knot.org/proofs/Furstenberg.shtml , since Wikipedia is going away in a day or so.)

- Mon Jan 16, 2012 4:27 am UTC
- Forum: Computer Science
- Topic: Mind Blowing Algorithms
- Replies:
**76** - Views:
**26607**

### Re: Mind Blowing Algorithms

I saw the following code online for the number of 1s. Haven't tested it. /* count number of 1's in 9-bit argument (Schroeppel) */ unsigned count_ones(unsigned36 a) { return ((a * 01001001001) /* 4 adjacent copies */ & 042104210421) /* every 4th bit */ % 15; /* casting out 15.'s in hexadecimal */...

- Mon Jan 16, 2012 4:22 am UTC
- Forum: Religious Wars
- Topic: The Rise and Fall of Programming Languages in 2011
- Replies:
**20** - Views:
**8799**

### Re: The Rise and Fall of Programming Languages in 2011

Interesting that C++ took a nosedive around 2005 ... That was about when some of the standards were changed (including the addition of namespaces). Um, no? The first standard was published in 1998 (including namespaces), and the second in 2011. There was a revision around 2003 but those were only m...

- Mon Jan 16, 2012 4:13 am UTC
- Forum: Mathematics
- Topic: New types of numbers
- Replies:
**38** - Views:
**6205**

### Re: New types of numbers

Gaps? I thought [ the surreals ] were the largest possible ordered field. How can you have gaps in that? For example, there is a "gap" between the finite surreals (surreals bounded by two real numbers) and the positive infiinite surreals. Or, for example, between the surreals smaller than...

- Sat Jan 14, 2012 8:44 pm UTC
- Forum: Religious Wars
- Topic: The Rise and Fall of Programming Languages in 2011
- Replies:
**20** - Views:
**8799**

### Re: The Rise and Fall of Programming Languages in 2011

Interesting that C++ took a nosedive around 2005 ... That was about when some of the standards were changed (including the addition of namespaces). And I'm surprised that Perl isn't more popular; it's powerful because every algorithm has been programmed in it. About the only thing missing is: print ...