## Search found 23 matches

- Tue Jul 09, 2013 1:08 am UTC
- Forum: Books
- Topic: Harry Potter and the Methods of Rationality
- Replies:
**1036** - Views:
**403354**

### Re: Harry Potter and the Methods of Rationality

When it comes to making a Horcrux, I'd expect it to take a sudden death not a long-drawn out slow bleed or other gradual end. It's the shock of the violent death that fractures the murderer's soul, not just the inflicting of serious wounds... Assuming there are such things as souls: I a...

- Tue Jul 02, 2013 1:59 pm UTC
- Forum: Books
- Topic: Harry Potter and the Methods of Rationality
- Replies:
**1036** - Views:
**403354**

### Re: Harry Potter and the Methods of Rationality

I am wondering if... ...Hermione has created a horcrux. Perhaps an attempted murder (-->Draco) is already enough to make one, if you truly mean to murder. After all, she has been acting quite weird since then; something you would expect from a 12-year-old girl with a split soul. When she ...

- Thu Oct 11, 2012 6:56 pm UTC
- Forum: Science
- Topic: Black Holes - not (yet) possible?
- Replies:
**279** - Views:
**46038**

### Re: Black Holes - not (yet) possible?

Ok, so basically what I understood was, that the falling object does not touch the event horizon by "reaching" it but the event horizon rather expands and reaches the object, while it is still on its way falling. :shock: Faszinating. Which, in consequence means that the only thing, that ca...

- Sun Oct 07, 2012 7:05 am UTC
- Forum: Science
- Topic: Black Holes - not (yet) possible?
- Replies:
**279** - Views:
**46038**

### Re: Black Holes - not (yet) possible?

So as an external observer, what you would see is the object fall towards the black hole, the objects clock (as you observe it) would slow and the object would fade away. Meanwhile, the object's mass would have been added to the black hole. How much time would it take the object to "fade away&...

- Sun Oct 07, 2012 12:30 am UTC
- Forum: Science
- Topic: Black Holes - not (yet) possible?
- Replies:
**279** - Views:
**46038**

### Black Holes - not (yet) possible?

The closer an object gets to a black hole, the slower its time passes. At the event horizon, its time would stand still. If I throw an object into a black hole and watch it from a certain distance, I will see it become slower and slower, coming asymptotically closer to the event horizon, which it wi...

- Sun Jul 15, 2012 1:10 pm UTC
- Forum: Language/Linguistics
- Topic: Translations needed: Talk to Me in X
- Replies:
**30** - Views:
**12995**

### Re: Translations needed: Talk to Me in X

German (formal): "Sprechen Sie mit mir (auf) deutsch."

German (informal): "Sprich mit mir (auf) deutsch."

Norwegian: "Snakk med meg på norsk."

In Icelandic, I believe it would be "Tala með mig á Íslensku.", but I don't know for sure

German (informal): "Sprich mit mir (auf) deutsch."

Norwegian: "Snakk med meg på norsk."

In Icelandic, I believe it would be "Tala með mig á Íslensku.", but I don't know for sure

- Tue May 15, 2012 12:26 am UTC
- Forum: Mathematics
- Topic: f(g(x)) = g(f(x)) (commuting mappings)
- Replies:
**16** - Views:
**4047**

### Re: f(g(x)) = g(f(x)) (commuting mappings)

There's not really any "meat" to this equivalence I disagree! There is quite a lot "meat" to it, because we can now systematically construct well-defined(!) g-fuctions AND we can estimate their minimum number! There would still be some more possibilities for g than we can constr...

- Sun May 13, 2012 8:35 pm UTC
- Forum: Mathematics
- Topic: f(g(x)) = g(f(x)) (commuting mappings)
- Replies:
**16** - Views:
**4047**

### Re: f(g(x)) = g(f(x)) (commuting mappings)

Ok, you are right, there was a mistake in my thinking. Maybe I should specify what I mean by "isomorphic orbits", or at least try to describe what I have in mind: If we have an orbit like f(x)=x 1 , f 2 (x)=x 2 , f 3 (x)=x 3 ,... we would identify this with the quiver: •→•→•→•→... If we ha...

- Sun May 13, 2012 7:43 pm UTC
- Forum: Language/Linguistics
- Topic: Tala íslensku! (Icelandic practice)
- Replies:
**21** - Views:
**16793**

### Re: Tala íslensku! (Icelandic practice)

Gigano wrote:I really need some decent source material to really get into it, like a book.

try this: https://icelandic.hi.is/

This is almost certainly better than any book

- Fri May 11, 2012 10:54 am UTC
- Forum: Mathematics
- Topic: f(g(x)) = g(f(x)) (commuting mappings)
- Replies:
**16** - Views:
**4047**

### Re: f(g(x)) = g(f(x)) (commuting mappings)

Thank you for your answers so far! I am especially fund of jestingrabbits method :D Going through the orbits and see what happens is definitely a very smart idea. I've tried to think that idea a bit further and come up with this so far: It should be possible to identify each orbit with a quiver ( = ...

- Tue May 08, 2012 11:35 pm UTC
- Forum: Mathematics
- Topic: f(g(x)) = g(f(x)) (commuting mappings)
- Replies:
**16** - Views:
**4047**

### Re: commutating maps

rather than fog=gof, you want f(g(x))=g(f(x)) for all x in X. It's a subtle but important difference. What is the difference? I thought it meant the same. But perhaps that's because I didn't pay enough attention in first semester :P I'm afraid I cannot give any more context other than that a soluti...

- Tue May 08, 2012 10:46 pm UTC
- Forum: Mathematics
- Topic: f(g(x)) = g(f(x)) (commuting mappings)
- Replies:
**16** - Views:
**4047**

### Re: commutating maps

Any idea how to find those g in G, or at least some of them?

I mean except for the "trivial" ones like id

I mean except for the "trivial" ones like id

_{X}, f, f², f³,... (and f^{-1}if it exists).- Tue May 08, 2012 6:20 pm UTC
- Forum: Mathematics
- Topic: f(g(x)) = g(f(x)) (commuting mappings)
- Replies:
**16** - Views:
**4047**

### f(g(x)) = g(f(x)) (commuting mappings)

I have the following mathematical problem and no idea where to find a solution for it. Perhaps one of you can help? Given a set X and a map f:X-->X Let G be the set of maps, that commutate with f, that is: G = {g:X-->X | g°f = f°g} How can I find and describe G? X may be any kind of set, but if it h...

- Fri May 04, 2012 9:54 am UTC
- Forum: Language/Linguistics
- Topic: Norsktrening [Norwegian practice]
- Replies:
**7** - Views:
**2433**

### Re: Norwegian practice thread [Norsktrening thread]

Hmmm... dette skulle egentlig være en norsktrening, men jeg har så langt ikke sett ett eneste ord på norsk her

Kom igjen, folkens!!

Kom igjen, folkens!!

- Wed May 02, 2012 1:22 pm UTC
- Forum: Language/Linguistics
- Topic: English to norwegian translation - Help wanted!
- Replies:
**6** - Views:
**2754**

### Re: English to norwegian translation - Help wanted!

I don't think most of these words exist in Norwegian, so you would have to re-invent them. Here a few suggestions: wetware - "bløtvare" or maybe "blautvare", which sounds more nynorsk to me, although I don't know much nynorsk artificial neurological system - "kunstig nervesy...

- Fri Jan 27, 2012 12:13 pm UTC
- Forum: Mathematics
- Topic: "question theory"?
- Replies:
**16** - Views:
**3552**

### Re: "question theory"?

@Deslato: I think we are talking about exactly the same thing, just with different words. I've heard of computer programs that were supposed to generate proofs automatically, but simply got lost in the vast number of possible proofs. So 99.99% of what they did was meaningless and boring, because the...

- Thu Jan 26, 2012 5:33 pm UTC
- Forum: Mathematics
- Topic: "question theory"?
- Replies:
**16** - Views:
**3552**

### Re: "question theory"?

Today I talked to a math professor who teaches logic, and she told me she didn't know about any such thing as "question theory", at least not within mathematics. If she doesn't know about it, then probably it really doesn't exist. So now there are three possibilities: 1. No one has ever th...

- Wed Jan 25, 2012 9:02 am UTC
- Forum: Mathematics
- Topic: "question theory"?
- Replies:
**16** - Views:
**3552**

### Re: "question theory"?

why would we want a computer to give us questions to answer when it can already answer the questions it's posing? Wouldn't that be a substantial progress? Today we can give a computer a certain well-defined problem and with some luck, make it solve it automatically. If a computer could ask question...

- Tue Jan 24, 2012 8:39 pm UTC
- Forum: Mathematics
- Topic: "question theory"?
- Replies:
**16** - Views:
**3552**

### Re: "question theory"?

thefreiburger wrote: - Defining equivalence for questions (e.g. "5+[?]=8" ~ "3+[?]=6") I'd say these are no longer questions, but propositions, despite the presence of "question words" for them in English: "What you add 5 to in order to get 8 is what you add 3 to ...

- Tue Jan 17, 2012 3:45 pm UTC
- Forum: Language/Linguistics
- Topic: Sprechen Sie Deutsch bitte! [German practice]
- Replies:
**878** - Views:
**254811**

### Re: Sprechen Sie Deutsch bitte! [German practice]

Nein, wusste ich nicht

Ich hab's nicht so mit der Auseinander- und Zusammenschreibung. Das ist meine größte Schwachstelle in der deutschen Sprache.

Ich hab's nicht so mit der Auseinander- und Zusammenschreibung. Das ist meine größte Schwachstelle in der deutschen Sprache.

- Tue Jan 17, 2012 3:41 pm UTC
- Forum: Mathematics
- Topic: "question theory"?
- Replies:
**16** - Views:
**3552**

### Re: "question theory"?

Is there really more to a question than a proposition with something missing? I don't know, but I would guess a question is simply a proposition with "gaps". The simplest example would be an equation with an unknown variable. In any symbolically formulated proposition you could replace on...

- Sun Jan 15, 2012 8:26 pm UTC
- Forum: Language/Linguistics
- Topic: Sprechen Sie Deutsch bitte! [German practice]
- Replies:
**878** - Views:
**254811**

### Re: Sprechen Sie Deutsch bitte! [German practice]

Wow, wenn man das hier alles so liest, wird einem erst klar, wie kompliziert die deutsche Sprache ist... Als Muttersprachler ist einem das garnicht so bewusst, man spricht halt einfach :) Ich glaube das schwierigste ist die richtige Verwendung von Füllwörtern. Gutes, lebendiges Deutsch lebt von Füll...

- Sun Jan 15, 2012 12:30 pm UTC
- Forum: Mathematics
- Topic: "question theory"?
- Replies:
**16** - Views:
**3552**

### "question theory"?

Is there a mathematical discipline for constructing and analysing questions, something like " question theory " maybe? I mean, if logic is the discipline for constructing, analysing and proving propositions (=answers!), there should be a discipline that deals with questions, too. I have tr...