## Search found 3182 matches

Fri Jan 11, 2019 3:14 pm UTC
Forum: Mathematics
Topic: Favorite Mathematical Equation
Replies: 87
Views: 13417

### Re: Favorite Mathematical Equation

Therefore the solution set to the polynomial equation x2 - x = 0 is x ∈ {0,1} = 2.

x∈2. It just sounds wrong.
Thu Jan 10, 2019 7:22 pm UTC
Forum: Science
Topic: quarkcosh1's miscellaneous science posts
Replies: 73
Views: 7091

### Re: quarkcosh1's miscellaneous science posts

What is interesting is the possibility that, starting N digits down Pi and thence every Mth digit, you might find just 2,2,2,2… forever. For arbitrary, possibly transfinite , N and M, that mesh nicely into every other sequence being looked for. Every digit of a real number is at a finite position.
Thu Jan 10, 2019 7:12 pm UTC
Forum: Science
Topic: What is my Exact Mailing Address?
Replies: 11
Views: 1394

### Re: What is my Exact Mailing Address?

It doesn't say the term is archaic. It says that generally in English, we now call North and South America distinct continents, while "The Americas" collectively refers to both, and "America" most often refers to the U.S. What is archaic is referring to The Americas / the America...
Thu Jan 10, 2019 12:29 pm UTC
Forum: Science
Topic: Stars in background of deep-sky photos are in foreground
Replies: 21
Views: 1637

### Re: Stars in background of deep-sky photos are in foreground

ucim wrote:You mean, by using alternative facts?

Yes. Also, if the Earth were an infinite flat plane, the gravitational field would not vary with altitude.
Thu Jan 10, 2019 4:09 am UTC
Forum: Science
Topic: Stars in background of deep-sky photos are in foreground
Replies: 21
Views: 1637

### Re: Stars in background of deep-sky photos are in foreground

I think his statement would be correct though if the distance to the moon were not so much greater than its diameter.
Wed Jan 09, 2019 4:56 pm UTC
Forum: Science
Topic: quarkcosh1's miscellaneous science posts
Replies: 73
Views: 7091

### Re: quarkcosh1's miscellaneous science posts

Again, trying formulas at random because you feel like some of the special functions could be connected to the topic in some way is not science . The actual way these formulas are discovered is by creating mathematical models that are meaningful on their own and then finding that the model's predict...
Tue Jan 08, 2019 8:47 pm UTC
Forum: Science
Topic: Stars in background of deep-sky photos are in foreground
Replies: 21
Views: 1637

### Re: Stars in background of deep-sky photos are in foreground

Yeah, I feel like using a telescope to read a magazine might be overkill.
Thu Jan 03, 2019 2:35 am UTC
Topic: 1732: "Earth Temperature Timeline"
Replies: 540
Views: 106779

### Re: 1732: "Earth Temperature Timeline"

Great info! Do we know, out of these 4 contributors to global warming, what weight do each of them carry? The focus in the general public has been on carbon dioxide emissions. Some of these are factors are getting multiplied together, so you can't describe one as "mattering more" the way ...
Mon Dec 31, 2018 7:09 pm UTC
Forum: Science
Topic: Miscellaneous Science Questions
Replies: 2904
Views: 677105

### Re: Miscellaneous Science Questions

I'm not sure there is any consistent way to have a universe with a definite start in the infinite past. But if there is, its age would still just be "countably infinite" and the current year could not be consistently assigned any ordinal. If it were, either it would be a limit ordinal, in ...
Mon Dec 31, 2018 9:18 am UTC
Forum: Science
Topic: Miscellaneous Science Questions
Replies: 2904
Views: 677105

### Re: Miscellaneous Science Questions

I think actual, observed physics rules this out, but nothing logically prevents this from being the year "omega + 6000", where omega is the first transfinite ordinal. For the other view, I once had my freshman philosophy professor make the claim that tomandlu asked about. No, I do not thi...
Fri Dec 28, 2018 9:58 pm UTC
Forum: Science
Topic: Miscellaneous Science Questions
Replies: 2904
Views: 677105

### Re: Miscellaneous Science Questions

I think tomandlu is imagining starting at some particular point and then reaching an infinite future, which does seem impossible, since infinity is unreachable. It's certainly true that the universe cannot have started "infinity years ago," because if the universe is infinitely old, it had...
Wed Dec 26, 2018 12:43 am UTC
Forum: Science
Topic: Childhood (not so) crackpot theories
Replies: 435
Views: 58844

### Re: Childhood (not so) crackpot theories

It's hard for me to visualize a fly "thinking." I know that they do, in the sense that they make decisions, learn, remember, etc., but their lack of any true brain makes me suspect their cognitive processes are very different from mine. But I would be willing to believe that for a good def...
Sun Dec 23, 2018 12:19 am UTC
Forum: Mathematics
Topic: Favorite Mathematical Equation
Replies: 87
Views: 13417

### Re: Favorite Mathematical Equation

doogly wrote:
Carmeister wrote:I don't think that's an equation.

It's equal to something, just left as an exercise to the reader. Which is everyone's favorite, really.

WolframAlpha gives a solution in the form of the upper incomplete gamma function, which seems a bit like cheating.
Sat Dec 22, 2018 8:29 am UTC
Forum: Science
Topic: quarkcosh1's miscellaneous science posts
Replies: 73
Views: 7091

### Re: quarkcosh1's miscellaneous science posts

What are the morphisms in this 2-category? I don't get it at all. There is some actual physical reason the dimensionless constants have the values they do (though there might not be a good reason), but we can't figure that reason out just by looking at random lists of mathematical expressions until ...
Thu Dec 20, 2018 11:55 am UTC
Forum: Science
Topic: quarkcosh1's miscellaneous science posts
Replies: 73
Views: 7091

### Re: The fine structure constant and the quark mass ratios derived from the j invariant

Doing a bunch of random, unmotivated calculations and attempting to spot similar numbers by eye is not a derivation. It's not even really numerology. It's not even not even wrong.
Thu Dec 20, 2018 11:54 am UTC
Forum: Science
Topic: What is my Exact Mailing Address?
Replies: 11
Views: 1394

### Re: What is my Exact Mailing Address?

You also should give a time range within which you would like the package to be delivered. For instance, it will do no good to deliver it in ten billion years.
Wed Dec 19, 2018 12:34 pm UTC
Forum: Science
Topic: Biology: Wolves vs. Humans
Replies: 45
Views: 4086

### Re: Biology: Wolves vs. Humans

The outer edges of the town naturally spawn young, incompetent goat-herders. So why did it take so long for the AI to learn to camp the ones near wolf spawns?
Sun Dec 16, 2018 7:32 pm UTC
Forum: Science
Topic: Biology: Wolves vs. Humans
Replies: 45
Views: 4086

### Re: Biology: Wolves vs. Humans

The difference is that the man did not fight the wolf, in the sense that he did not fight at all. He simply tried to save his arm. There is a difference between someone trying to save themself while fending off a wolf and someone trying to kill a wolf. Citing that attack is like citing a massacre to...
Sat Dec 15, 2018 11:16 pm UTC
Forum: Science
Topic: Biology: Wolves vs. Humans
Replies: 45
Views: 4086

### Re: Biology: Wolves vs. Humans

What exactly are you proposing I look up to support my claim that an inexperienced person can stab things in the back with a makeshift spear? Is there like a video out there of people doing it? Should I go and make my own spear and try it? So far, you have looked something up, a story of a person be...
Sat Dec 15, 2018 3:57 am UTC
Forum: Science
Topic: Biology: Wolves vs. Humans
Replies: 45
Views: 4086

### Re: Biology: Wolves vs. Humans

Well, stabbing things with spears is again the main way humans have hunted for hundreds of thousands of years and also the main way they fought each other. You seem to be suggesting that stabbing things in the back, famously the easiest way to kill people by surprise, is not the easiest way to kill ...
Sat Dec 15, 2018 3:09 am UTC
Forum: Science
Topic: Biology: Wolves vs. Humans
Replies: 45
Views: 4086

### Re: Biology: Wolves vs. Humans

Also because she had a rope. Well, if the wolf isn't aware of your presence, you can just fashion a makeshift spear and impale it. You said catch it unaware, not "have enough time to fashion a lethal weapon using no tools and to become skilled enough with that weapon to incapacitate a large pr...
Fri Dec 14, 2018 7:27 am UTC
Forum: Science
Topic: Biology: Wolves vs. Humans
Replies: 45
Views: 4086

### Re: Biology: Wolves vs. Humans

Well, if the wolf isn't aware of your presence, you can just fashion a makeshift spear and impale it. But if we are assuming no weapons, it will be harder. Even then, attacking a wolf from behind gives you a much, much better shot than from the front. The story you quoted points out that you can lit...
Fri Dec 14, 2018 7:19 am UTC
Forum: Science
Topic: disproof of boltzman brain?
Replies: 55
Views: 6171

### Re: disproof of boltzman brain?

Quizatzhaderac wrote:Each sub section (taken desperately) has a chance of having less than maximal entropy.

What about the stoic subsections that know no desperation?
Thu Dec 13, 2018 11:21 pm UTC
Forum: Science
Topic: Biology: Wolves vs. Humans
Replies: 45
Views: 4086

### Re: Biology: Wolves vs. Humans

If the human is caught unaware, of course he'll be at a disadvantage, but if the wolf is caught unaware, it won't even be a fight, so that doesn't seem like the fairest comparison.
Wed Dec 12, 2018 9:38 pm UTC
Forum: Science
Topic: How to calculate the surface tension between water and pure oxygen gas
Replies: 5
Views: 2128

### Re: How to calculate the surface tension between water and pure oxygen gas

Surface strain is the imperativeness, or work, required to grow the surface region of a liquid due to intermolecular forces. Since these intermolecular forces vary dependent upon the possibility of the liquid (e.g. water versus fuel) or solutes in the liquid (e.g. surfactants like chemical), each c...
Wed Dec 12, 2018 4:12 am UTC
Forum: Science
Topic: Building a chair out of glue
Replies: 6
Views: 978

### Building a chair out of glue

It is a surprising but well-known fact that modern wood glue is much stronger than wood. When I first learned this as a little kid I was both fascinated and suspicious: how could the fastener be stronger than the main construction material? Why not just build everything out of glue? That's obviously...
Tue Dec 11, 2018 9:05 pm UTC
Forum: Science
Topic: Science fleeting thoughts
Replies: 191
Views: 30885

### Re: Science fleeting thoughts

The whole point of this discussion is that the SI units have been redefined. The mole is now defined by SI as follows: The mole, symbol mol, is the SI unit of amount of substance. One mole contains exactly 6.022 140 76 × 10 23 elementary entities. This number is the fixed numerical value of the Avog...
Tue Dec 11, 2018 8:10 am UTC
Forum: Language/Linguistics
Topic: Moderatores Populusque XKCDi [Latin]
Replies: 167
Views: 69072

### Re: Moderatores Populusque XKCDi [Latin]

Yeah, "disciplina" is first declension, and "per" takes the accusative, so it's definitely "per disciplinam." The possessive adjective "meus/-a/-um" has to agree with the noun it is modifying ("discliplinam"), so it also needs the feminine accusative...
Mon Dec 10, 2018 9:05 pm UTC
Forum: Science
Topic: Biology: Wolves vs. Humans
Replies: 45
Views: 4086

### Re: Biology: Wolves vs. Humans

Not really. A dog's neck is not nearly as strong as your leg. And I know if they can plant all their feet they can use other muscles too, but in practice, the human is going to win. Like, have you ever played tug of war with a large dog to a decision? Most people keep playing until they get bored an...
Sun Dec 09, 2018 10:32 pm UTC
Forum: Language/Linguistics
Topic: Punnilingus
Replies: 135
Views: 58249

### Re: Punnilingus

How can "A Prairie Home Companion" possibly still be running? It's the most boring radio show on Earth.
Sat Dec 08, 2018 6:27 am UTC
Forum: Language/Linguistics
Topic: Annoying words, and Words You Hate
Replies: 1969
Views: 453300

### Re: Annoying words, and Words You Hate

OK, I get the noun vs. verb thing. Though, at the end of the day, the new use is hardly surprising.
Fri Dec 07, 2018 11:29 pm UTC
Forum: Language/Linguistics
Topic: Annoying words, and Words You Hate
Replies: 1969
Views: 453300

### Re: Annoying words, and Words You Hate

"transitioning" It somehow escaped corporate meetings and infected the general public. Just use "changing" or "switching" or even "in transition to" for crying out loud. These days, I mostly hear that term for people in a gender transition, MTF or FTM. The te...
Fri Dec 07, 2018 9:10 pm UTC
Forum: Science
Topic: disproof of boltzman brain?
Replies: 55
Views: 6171

### Re: disproof of boltzman brain?

It is not the case that a larger universe is more likely to develop a brain, because the issue is not just size, but entropy. A very large universe that is at thermal equilibrium will not produce brains in any way except by spontaneous fluctuations, because it's in equilibrium already, so nothing el...
Thu Dec 06, 2018 8:42 pm UTC
Forum: Science
Topic: disproof of boltzman brain?
Replies: 55
Views: 6171

### Re: disproof of boltzman brain?

I mean that a large universe which develops into a vacuum with a surprise brain in the middle is still more likely than a large universe with such low entropy that not only do you get a brain, but also planets and stars and stuff. Because the former is far higher entropy.
Thu Dec 06, 2018 8:37 pm UTC
Forum: Science
Topic: Biology: Wolves vs. Humans
Replies: 45
Views: 4086

### Re: Biology: Wolves vs. Humans

a single bite could be quite serious if it's from a real dog, not a house rat. and dogs have additionally four nasty claws whith which they can bother you while you try to get a hold on their neck. i don't think it's as clear as that. we don't have any natural weapon which could pierce a wolf's ski...
Thu Dec 06, 2018 2:10 pm UTC
Forum: Science
Topic: Biology: Wolves vs. Humans
Replies: 45
Views: 4086

### Re: Biology: Wolves vs. Humans

a single bite could be quite serious if it's from a real dog, not a house rat. and dogs have additionally four nasty claws whith which they can bother you while you try to get a hold on their neck. i don't think it's as clear as that. we don't have any natural weapon which could pierce a wolf's ski...
Thu Dec 06, 2018 2:05 pm UTC
Forum: Science
Topic: disproof of boltzman brain?
Replies: 55
Views: 6171

### Re: disproof of boltzman brain?

The universe in this model is infinite, not a single point. But due to inflation, a region that was once extremely small (though not literally a single point) is now larger than the entire observable universe. This inflationary event may be the low entropy event we are discussing. In any case, the i...
Thu Dec 06, 2018 3:47 am UTC
Forum: Science
Topic: disproof of boltzman brain?
Replies: 55
Views: 6171

### Re: disproof of boltzman brain?

That doesn't resolve the problem, as big universes are still more likely to develop one or more Boltzmann brains than the types of brains we consider. Even if the total population of brains over the course of history is 10^10^10, the Boltzmann brains will still outnumber them.
Thu Dec 06, 2018 3:45 am UTC
Forum: Science
Topic: Science fleeting thoughts
Replies: 191
Views: 30885

### Re: Science fleeting thoughts

Thesh wrote:That would also say that 1 is the only unit in the natural numbers, which is probably more applicable.

The natural numbers don't form a ring. In the ring of integers, there are two units, 1 and -1.
Thu Dec 06, 2018 3:44 am UTC
Forum: Science
Topic: Biology: Wolves vs. Humans
Replies: 45
Views: 4086

### Re: Biology: Wolves vs. Humans

Even in a no-holds-barred grudge match, I'm fairly confident five adult humans would defeat three adult wolves. Assuming the humans are reasonably fit, anyway. There is this trope out there that humans are somehow uniquely weak animals, and it is simply inaccurate. We are much larger than wolves. Ev...