Search found 5554 matches

by Xanthir
Mon Mar 31, 2008 11:37 pm UTC
Forum: Logic Puzzles
Topic: Norm of radix, addition by 1
Replies: 4
Views: 2685

Re: Norm of radix, addition by 1

Seems to be 1 + n(t-1)2, where n is the number of (t-1)s present in the original number.
by Xanthir
Mon Mar 31, 2008 7:27 pm UTC
Forum: Gaming
Topic: Fun with Portal Guns
Replies: 233
Views: 16361

Re: Fun with Portal Guns

SoapyHobo wrote:But portals don't have a top or bottom, they're just holes.

Holes have a top and bottom too. Portals are oriented. In the challenge levels you often have to be careful to set them up correctly so you don't come out upside down and waste valuable time pointing yourself in the correct direction.
by Xanthir
Mon Mar 31, 2008 4:12 pm UTC
Forum: Logic Puzzles
Topic: Numeric Sequence
Replies: 10
Views: 2597

Re: Numeric Sequence

It's ridiculous that someone would be so fascinated by a seemingly uninteresting sequence to come up with a polynomial of degree 71 to describe it. Hey, I'm honestly surprised there's a finite degree polynomial that describes some aspect of it at all. Also, Conway is crazy. I mean it literally. In ...
by Xanthir
Mon Mar 31, 2008 4:08 pm UTC
Forum: Mathematics
Topic: "pi" in different metrics
Replies: 52
Views: 7536

Re: "pi" in different metrics

Another way to see that you can't get a (norm-induced) metric with a triangle as its unit ball is simply because d(x,0) = d(-x,0) must be satisfied, which implies that the unit ball must be symmetric through the origin, which a triangle isn't. This is wrong. It must be symmetric across the origin u...
by Xanthir
Mon Mar 31, 2008 4:03 pm UTC
Forum: Coding
Topic: I already know how to do everything at Project Euler (split)
Replies: 26
Views: 5006

Re: I already know how to do everything at Project Euler (split)

While the largest prime factor can (and in fact, often will be) larger than the sqrt of the number, you don't have to *search* past the sqrt. Anytime you find a factor on one side of the sqrt you'll find the corresponding factor on the other side without having to search. Larger hint/basically solvi...
by Xanthir
Mon Mar 31, 2008 3:45 pm UTC
Forum: Mathematics
Topic: "pi" in different metrics
Replies: 52
Views: 7536

Re: "pi" in different metrics

Another way to see that you can't get a (norm-induced) metric with a triangle as its unit ball is simply because d(x,0) = d(-x,0) must be satisfied, which implies that the unit ball must be symmetric through the origin, which a triangle isn't. This is wrong. It must be symmetric across the origin u...
by Xanthir
Mon Mar 31, 2008 2:45 pm UTC
Forum: Computer Science
Topic: I have a question about the future of cryptography.
Replies: 43
Views: 8511

Re: I have a question about the future of cryptography.

The quantum encryption scheme I'm familiar with is simply a way of securely exchanging a standard symmetric key. Since symmetric cyphers are much more secure than asymmetrics for a given key length, it's useful to be able to use them. But, since they're symmetric , the same key is used for encryptin...
by Xanthir
Mon Mar 31, 2008 2:29 pm UTC
Forum: Religious Wars
Topic: PHP versus ColFusion
Replies: 20
Views: 8311

Re: PHP versus ColFusion

PHP: Sucks. Insecure by design. Don't use it. Explain. Magic quotes can (and should be) turned off by configuring your server or dropping an htaccess file where necessary. SQL injection can trivially be defeated by using the appropriate escape function (in mysql, just call mysql_real_escape_string)...
by Xanthir
Mon Mar 31, 2008 1:25 pm UTC
Forum: Science
Topic: DNA and why we need it.
Replies: 10
Views: 1482

Re: DNA and why we need it.

Viruses introduce a new mix of genetic information. The mutations that occur due to this new mix are the part of many new and exciting evolutionary traits. While evolution is not solely linked to viral genetics, there is a part that it plays. For example, our immune system only exists because of th...
by Xanthir
Mon Mar 31, 2008 1:10 pm UTC
Forum: Science
Topic: Quantum Mechanics and Consiousness
Replies: 115
Views: 7259

Re: Quantum Mechanics and Consiousness

ATCG provided a link to the wikipedia article on supertasks, wherein they discuss some possibilities for physically realizing them. Closed Timelike Curves (time travel, in other words) may provide a way to execute an infinite number of algorithm steps in a finite amount of time. There is no assuran...
by Xanthir
Mon Mar 31, 2008 4:00 am UTC
Forum: Logic Puzzles
Topic: Buffalo buffalo buffalo.
Replies: 58
Views: 22908

Re: Buffalo buffalo buffalo.

Works for me. If we define adjective-ninja to be "cool", verb-ninja to be "steal from", and noun-ninja to be "pirate", then an interpretation of it is thus: "Pirates that cool pirates steal from in turn steal from pirates that other pirates steal from." But n...
by Xanthir
Mon Mar 31, 2008 3:59 am UTC
Forum: Logic Puzzles
Topic: Numeric Sequence
Replies: 10
Views: 2597

Re: Numeric Sequence

Token wrote:I think it's sufficiently varied that you shouldn't feel bad about posting it, but sufficiently similar that it's easy to immediately work out the answer.

Agreed. Sorry if I made you feel bad, Koterpillar. ^_^
by Xanthir
Mon Mar 31, 2008 3:56 am UTC
Forum: Religious Wars
Topic: PHP versus ColFusion
Replies: 20
Views: 8311

Re: PHP versus ColFusion

Thanks for your info. What is Lisp? Lisp is a programming language often loved by academics (perhaps mostly due to its cachet as a language loved by academics, circularly enough), and especially loved by me. Hunchentoot is an http server (like Apache) built on Lisp. It can function as a standalone ...
by Xanthir
Mon Mar 31, 2008 2:28 am UTC
Forum: Science
Topic: Quantum Mechanics and Consiousness
Replies: 115
Views: 7259

Re: Quantum Mechanics and Consiousness

There are some exotic setups exploiting even more advanced parts of physics that might be able to solve undecidable problems, but for the moment they are entirely magical. I would be hugely interested and greatly appreciative if you can point me in an informative direction. ATCG provided a link to ...
by Xanthir
Sun Mar 30, 2008 4:20 pm UTC
Forum: Gaming
Topic: Stupidity in Games
Replies: 46
Views: 5837

Re: Stupidity in Games

Civ II was pretty ridiculous. Peace with your enemies is pretty much useless, since they have no principle and always break the treaty. When you finally have a peace treaty, all they do is demand knowledge constantly and then declare war when you consistently refuse to give them free stuff. Gah, th...
by Xanthir
Sun Mar 30, 2008 4:11 pm UTC
Forum: Logic Puzzles
Topic: My write-up of the "Blue Eyes" solution (SPOILER A
Replies: 1368
Views: 405452

Re: My write-up of the "Blue Eyes" solution (SPOILER A

Same with me. My intuition still rears up every once in a while when my thoughts turn to this problem, and it bugs me until I work through everything again and bludgeon it down with logic. I just accept that we humans are not good at arbitrary-depth nested hypotheticals. Hell, nested anything, reall...
by Xanthir
Sun Mar 30, 2008 4:05 pm UTC
Forum: Religious Wars
Topic: Forum Software
Replies: 11
Views: 9597

Re: Forum Software

I've had user experience with ubb, phpbb 2 and 3, and smf. I think I like SMF the best. I helped guide a forum through its startup, and though there are definitely some ways to set up an smf board that are really user-unfriendly, when you catch the right ones it feels really slick.
by Xanthir
Sun Mar 30, 2008 4:02 pm UTC
Forum: Religious Wars
Topic: Browsers
Replies: 187
Views: 34164

Re: Browsers

Well, FF 2.0.0.13 gets up to 52/100 on Acid3. 2.0.0.12 was only going 50/100. I should try out the FF3b.
by Xanthir
Sun Mar 30, 2008 3:58 pm UTC
Forum: Religious Wars
Topic: PHP versus ColFusion
Replies: 20
Views: 8311

Re: PHP versus ColFusion

I have too little experience to *really* compare the various languages here, but I'm happy with PHP. It's simple and easy to pick up, especially if you have any sort of programming background. The function-naming is a little annoying, because they switch between using underscores and nothing at all,...
by Xanthir
Sat Mar 29, 2008 4:51 pm UTC
Forum: Gaming
Topic: AFK Games
Replies: 17
Views: 4829

Re: AFK Games

Well, I was going to be all "Try Progress Quest", but FACM beat me to it. You'll rue this day, FACM! Rue it I say! .. wait, that's really not a big deal... so.. um.. nevermind on the ruing! Maybe give Burning Sand a go? Though.. it's.. not really a game. In the sense of there being goals ...
by Xanthir
Sat Mar 29, 2008 4:49 pm UTC
Forum: Logic Puzzles
Topic: Courtesy of "The Art and Craft of Problem Solving"
Replies: 24
Views: 5486

Re: Courtesy of "The Art and Craft of Problem Solving"

3 Definition of rounds: n secretly writes down number and passes only that number to n+1 1st round: write down (received number + (random number OR salary)) 2nd round: write down (received number + (random number OR salary - opposite to 1st round choice)) 3rd round: ...
by Xanthir
Sat Mar 29, 2008 4:41 pm UTC
Forum: Logic Puzzles
Topic: Numeric Sequence
Replies: 10
Views: 2597

Re: Numeric Sequence

Dont' know if this has been done before, but I know it's a common and well-known puzzle. Or rather, a tiny variation on a common and well-known puzzle. The next number is 31122111311141. You're doing the standard "count the number of repeated digits and then state the digit, for each sequen...
by Xanthir
Sat Mar 29, 2008 4:37 pm UTC
Forum: Logic Puzzles
Topic: My write-up of the "Blue Eyes" solution (SPOILER A
Replies: 1368
Views: 405452

Re: My write-up of the "Blue Eyes" solution (SPOILER A

Excuse me, you are correct, sir. 98 is the minimum number of blue-eyed people each islander knows everyone else sees. And 97 is the minimum number of blue-eyed people each islander knows everyone knows everyone else sees. And 96 is the minimum number of blue-eyed people each islander knows everyone...
by Xanthir
Sat Mar 29, 2008 4:26 pm UTC
Forum: Logic Puzzles
Topic: Buffalo buffalo buffalo.
Replies: 58
Views: 22908

Re: Buffalo buffalo buffalo.

Works for me. If we define adjective-ninja to be "cool", verb-ninja to be "steal from", and noun-ninja to be "pirate", then an interpretation of it is thus:
"Pirates that cool pirates steal from in turn steal from pirates that other pirates steal from."
by Xanthir
Sat Mar 29, 2008 4:23 pm UTC
Forum: Logic Puzzles
Topic: 3 door problem
Replies: 88
Views: 27588

Re: 3 door problem

It is unclear, but I'm assuming that the host does *not* pick any box you've already picked. In that case:

Spoiler:
8/15, just as ss said, and for the same reasons.
by Xanthir
Sat Mar 29, 2008 4:18 pm UTC
Forum: Science
Topic: Quantum Mechanics and Consiousness
Replies: 115
Views: 7259

Re: Quantum Mechanics and Consiousness

In order to accomplish (2) I have to find a natural way to accomplish a non-computable task. Instead of moving up the hierarchy of abstraction (i.e., emergence), I propose to move down, way down, all the way to the Plank scale. (Indeed, I don't think I'm adding to or changing anything that Penrose ...
by Xanthir
Sat Mar 29, 2008 3:14 pm UTC
Forum: Science
Topic: Question Re: Giant Hole Through the Earth
Replies: 87
Views: 19997

Re: Physics 'challenge question' ceptnotrly

I'd say she doesn't survives such a journey, due to the extremely high air pressure and gravitational force pulling her limbs apart at the centre of earth. there are no significant gravitational forces at the centre of the earth Geez, even if there was, I can hardly see why it would pull her limbs ...
by Xanthir
Sat Mar 29, 2008 3:12 pm UTC
Forum: Science
Topic: Quantum Mechanics and Consiousness
Replies: 115
Views: 7259

Re: Quantum Mechanics and Consiousness

Heh, point taken. I had nothing better to offer this thread until that subject came up. On the subject of QM and consciousness, everyone else has made the points that I would. QM isn't magic, it doesn't have any relation to undecidability, and it can be modelled just fine on classical computers (tho...
by Xanthir
Sat Mar 29, 2008 3:04 pm UTC
Forum: Religious Wars
Topic: Browsers
Replies: 187
Views: 34164

Re: Browsers

Flayer wrote:Also, I'm not sure if you got this, but I don't use a Mac. I'm on Debian GNU/Linux.

Got that, but I was explaining *why* Webkit does what it does, which is informed by Safari and thus Mac's need to be pretty.
by Xanthir
Sat Mar 29, 2008 4:30 am UTC
Forum: Science
Topic: Quantum Mechanics and Consiousness
Replies: 115
Views: 7259

Re: Quantum Mechanics and Consiousness

I'm jumping in here too because, as I said in a previous thread, I find p-zombies incoherent. Please elaborate! Explain why you find p-zombies incoherent. Is it because it suggests there's such a thing as subjective aspects? Is it because it asumes there's a subjective aspect to us distinct from be...
by Xanthir
Sat Mar 29, 2008 12:12 am UTC
Forum: Gaming
Topic: Fun with Portal Guns
Replies: 233
Views: 16361

Re: Fun with Portal Guns

Are portals flexible? Could I put one on a piece of cloth and make a cloak out of it? If I could, I would have the other portal in a room with lots of random objects supplies, and then be able to pull things out of what seems to other people to be hammerspace at will. Also, if I get lost in the woo...
by Xanthir
Sat Mar 29, 2008 12:10 am UTC
Forum: Religious Wars
Topic: Underscores vs CamelCase
Replies: 107
Views: 63071

Re: Underscores vs CamelCase

Just so you know, that *does* make you a bad person.

I'm totally serious. I hate the designers of php for not settling on a single convention for function naming. They go back and forth between underscores and nothing at all.
by Xanthir
Fri Mar 28, 2008 11:52 pm UTC
Forum: Science
Topic: Quantum Mechanics and Consiousness
Replies: 115
Views: 7259

Re: Quantum Mechanics and Consiousness

The way I see it, anything that cog. sci. has to offer (valuable though it may be) is still perfectly compatible with a non-conscious, Turing machine/p-zombie/whatever. Those things can carry out all the same cognitive processes without having any conscious internal awareness of doing so. This just...
by Xanthir
Fri Mar 28, 2008 4:53 pm UTC
Forum: Religious Wars
Topic: Browsers
Replies: 187
Views: 34164

Re: Browsers

I mean to switch to the WebKit engine, because it seems to handle the Gnome theme better than Gecko does (buttons, fields, etc display properly Gnome-ly themed with WebKit) FF purposely uses its own library of widgets so that it doesn't have to depend on the OS. WebKit (Safari's rendering engine) d...
by Xanthir
Thu Mar 27, 2008 9:05 pm UTC
Forum: The Help Desk
Topic: Building an interactive spoiler box
Replies: 14
Views: 3207

Re: Building an interactive spoiler box

Your covering-div is a good idea. Why limit it to images? Just cover the whole spoiler box with it. However, then you'd have to calculate the appropriate size, which isn't possible. Hmm. Well, we're containing the spoiler in something, right? Rather than generating a *new* element to go on top of it...
by Xanthir
Thu Mar 27, 2008 6:25 pm UTC
Forum: Gaming
Topic: Fun with Portal Guns
Replies: 233
Views: 16361

Re: Fun with Portal Guns

The moon's lesser gravity will cause atmosphere to leak out faster than it does here on Earth. It'll also have a larger surface area with which to do it, due to the largeness of the atmospheric pocket.
by Xanthir
Thu Mar 27, 2008 6:21 pm UTC
Forum: Logic Puzzles
Topic: Three gods - Truth-teller/Liar/Random
Replies: 9
Views: 5151

Re: Three gods - Truth-teller/Liar/Random

Edit: Holy craps, I completely misunderstood something earlier. Wee!
by Xanthir
Thu Mar 27, 2008 6:18 pm UTC
Forum: Science
Topic: Biology is not "just Applied Chemistry"
Replies: 66
Views: 11222

Re: Evolution and Behavior as Emergent Properties of Biology

Hey, all I'm saying is, everything *is* at least slightly nail-ish. The hammer might not be the best tool all the time, but most problems *can* be described in terms of hammer-pounding. The pounding necessary might be too small or too precise to be realistically delivered by a hammer, but a theoreti...
by Xanthir
Thu Mar 27, 2008 6:15 pm UTC
Forum: Mathematics
Topic: Why do people dislike maths so much?
Replies: 258
Views: 26338

Re: Why do people dislike maths so much?

Random sidenote: The One Roll Engine is *really* cool.
by Xanthir
Thu Mar 27, 2008 3:40 pm UTC
Forum: Coding
Topic: Coding: Fleeting Thoughts
Replies: 9870
Views: 1779418

Re: Coding: Fleeting Thoughts

Any possibility of long-distance working? I've built up quite a bit of php and mysql experience, but I'm down South and wouldn't want to move.

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