## Search found 52 matches

Thu Oct 23, 2008 12:15 am UTC
Forum: General
Topic: How does a calculating prodigy calculate?
Replies: 20
Views: 2470

### Re: How does a calculating prodigy calculate?

That's interesting. I've read in a few different articles that as children they certain faculties in their brain didn't function (language processing, sequencing..usually left brain stuff), so they used their right brain to compensate for this. Mabye their right brain (visual, spatial) etc overdevel...
Mon Oct 20, 2008 4:22 am UTC
Forum: Science
Topic: Understanding Strings
Replies: 12
Views: 1525

### Re: Understanding Strings

From my understanding string theories promise to incorporate gravity into the standard model, but have little promise in explaining the contradictions which arise between GR and quantum mechanics. Do you have any references? Read the chapter "Supersymmetry, supra-dimensionality, and strings&qu...
Mon Oct 20, 2008 1:47 am UTC
Forum: Science
Topic: Understanding Strings
Replies: 12
Views: 1525

### Re: Understanding Strings

Read The Elegant Universe. It is a super review of basic theoretical physics, and lays out the case for String Theory. Yes, it is very controversial, even among physicists, but there are plenty of them who also believe that it's worth pursuing. When QM and GR are finally reconciled, it is hard to i...
Sun Oct 19, 2008 11:13 am UTC
Forum: General
Topic: How does a calculating prodigy calculate?
Replies: 20
Views: 2470

### Re: How does a calculating prodigy calculate?

The Mighty Thesaurus wrote:You don't just calculate it? I find this... odd.

A lot of trained mathematicians I know would not be able to do 24*37 instantly. You'd be surprised.
Sun Oct 19, 2008 10:28 am UTC
Forum: General
Topic: How does a calculating prodigy calculate?
Replies: 20
Views: 2470

### How does a calculating prodigy calculate?

I was reading about and autistic calculating prodigy who gave an explanation of how he did complex calculations (such as cube roots of 7 digit numbers) at lighting speed. What he described was that when doing a particular calculation, shapes would form in his head, these would then merge to form a n...
Sun Oct 19, 2008 10:10 am UTC
Forum: Science
Topic: Understanding Strings
Replies: 12
Views: 1525

### Re: Understanding Strings

Yeah I got the impression from what I have read that it (string theory) is more than a bit full of hype and overrated.
Sat Oct 18, 2008 6:49 am UTC
Forum: Science
Topic: Understanding Strings
Replies: 12
Views: 1525

### Re: Understanding Strings

True, but I'm not sure that that answers my question.
Thu Oct 16, 2008 1:20 pm UTC
Forum: Science
Topic: Understanding Strings
Replies: 12
Views: 1525

### Understanding Strings

I was reading (in Penrose's Road to Reality ) an explanation of how the theory of strings arose from hadronic physics. He drew feyman diagrams which were graphs representing the (possible) processes which produced particles C and D, when A and B collided. One in which A and B collide, and exchange a...
Mon Oct 13, 2008 1:07 am UTC
Forum: Mathematics
Topic: Favorite math jokes
Replies: 1452
Views: 494600

### Re: Favorite math jokes

Mathematics can cause much frustration
Involving many a calculation
While physics they say
Is like a good lay
Where as maths well it's just masturbation
Sat Oct 11, 2008 5:19 am UTC
Forum: Mathematics
Topic: Need help proving a trigometric identity
Replies: 11
Views: 2828

### Re: Need help proving a trigometric identity

You were on the rigfht track with what you did so far ....try multiplying out the denominator on the LHS then using the trigonometric identities 1+ cot^2(A)=cosec(A), and sec^(A) = tan@(A)+1. You should get LHS=RHS=1
Thu Oct 02, 2008 3:43 pm UTC
Forum: Science
Topic: Large Objects and Spin
Replies: 18
Views: 2470

### Re: Large Objects and Spin

BigBearBooth wrote:Without a textbook atm, but don't black holes and neutron stars have spin? I *think* they are the largest objects that have intrinsic spin. Moreover I think

Remember spin has little to do with angular momentum. Spin is more to do with the symmetry group which describes the object.
Thu Oct 02, 2008 2:45 pm UTC
Forum: Mathematics
Topic: Intersection of two spheres
Replies: 14
Views: 2169

### Re: Intersection of two spheres

Gowerly wrote:The intersection of a circle and a sphere is a line, so I assume you'll get that, assuming all three spheres intersect

When I say 3-sphere I mean the 3-manifold , not "3 spheres"
Thu Oct 02, 2008 12:04 pm UTC
Forum: Mathematics
Topic: Intersection of two spheres
Replies: 14
Views: 2169

### Re: Intersection of two spheres

What would one you get if you intersected two 3-spheres in a similar way?
Thu Oct 02, 2008 9:11 am UTC
Forum: Science
Topic: The Most Sciencey-Sounding Word/Phrase You've Heard
Replies: 176
Views: 35398

### Re: The Most Sciencey-Sounding Word/Phrase You've Heard

Pyschophysicist and Psychomathematician?
Thu Oct 02, 2008 8:52 am UTC
Forum: Science
Topic: Large Objects and Spin
Replies: 18
Views: 2470

### Re: Large Objects and Spin

BigBearBooth wrote:Without a textbook atm, but don't black holes and neutron stars have spin? I *think* they are the largest objects that have intrinsic spin.

Are you talking about spin or angular momentum here?
Sat Sep 27, 2008 10:28 am UTC
Forum: General
Topic: How do you describe a feeling?
Replies: 12
Views: 1952

### Re: How do you describe a feeling?

Purple? hrmm, they do say spirital people favour, mabye our mind relates feelings of awe to the colour purple
Sat Sep 27, 2008 10:24 am UTC
Forum: Science
Topic: How do plants know which direction to spiral?
Replies: 26
Views: 3128

### Re: How do plants know which direction to spiral?

Falmarri wrote:Try calling australia and asking which way the water flows in their toilets.

Be easier just to walk to my sink. (I'm aussie)
Sat Sep 27, 2008 6:16 am UTC
Forum: Science
Topic: How do plants know which direction to spiral?
Replies: 26
Views: 3128

### How do plants know which direction to spiral?

Hi all. I was thinking about the direction in which water rotates when you a pull the plug, in the southern hemisphere and northern hemisphere. We know that this has to do with the earths magnetic field pointing in a different direction in either hemisphere But I was wondering if the same concept ap...
Fri Sep 26, 2008 5:06 am UTC
Forum: Mathematics
Topic: Intercepting Vectors
Replies: 11
Views: 2087

### Re: Intercepting Vectors

It may increase your understanding of vectors to know that they don't truly intercept as such. Remember that vectors have no starting point and no defined position in space. When you add two vectors together, it helps to draw a diagram with them head to tail, but don't get this confused with them in...
Fri Sep 26, 2008 1:20 am UTC
Forum: Mathematics
Topic: What is a Tensor?
Replies: 20
Views: 3282

### Re: What is a Tensor?

Slightly related question. Matrices can be abstracted to linear transformations, linear transformations can be abstracted to tensors. Can tensors be then generalized to something more abstract?
Fri Sep 26, 2008 1:03 am UTC
Forum: Mathematics
Topic: Physics Problem (Relative Velocity)
Replies: 4
Views: 1124

### Re: Physics Problem (Relative Velocity)

THe problem does not specify where he has to land at the other side of the river. I suspect the the problem wants you to ignore the motion of the river. So just go use t=1.5/12 and see if your answer is the same as the one given
Thu Sep 25, 2008 11:27 pm UTC
Forum: Science
Topic: Childhood (not so) crackpot theories
Replies: 435
Views: 80704

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

I had a theory that one we would be able to make copies of ourselves, and that while one of us was sleeping the other could stay awake, so that we don't have to waste time sleeping.
Thu Sep 25, 2008 11:16 pm UTC
Forum: Language/Linguistics
Topic: Infinitely long words?
Replies: 26
Views: 4078

### Re: Infinitely long words?

Says who? I find long words with subtle or technical meaning very useful, although usually in a very specialized way. The word "specialized", for example, is much more useful in that last sentence than the word "a" is. In general the usefulness of words are inversely proportiona...
Thu Sep 25, 2008 7:34 am UTC
Forum: Language/Linguistics
Topic: Infinitely long words?
Replies: 26
Views: 4078

### Re: Infinitely long words?

A few disconnected thoughts: Since you never reach the end, it is nothing but anti's. So it's anti-what exactly? Remember that something can be infinitely long in different directions. You could take with a root morpheme, and add an infinite amount of prefixes, OR an infinite number of suffixes. Th...
Wed Sep 24, 2008 6:05 pm UTC
Forum: Language/Linguistics
Topic: Infinitely long words?
Replies: 26
Views: 4078

### Re: Infinitely long words?

Thanks for confirming that for me.
Wed Sep 24, 2008 5:30 pm UTC
Forum: Language/Linguistics
Topic: Infinitely long words?
Replies: 26
Views: 4078

### Re: Infinitely long words?

Imagine a morpheme with an infinite number of "anti" prefixes attached to it, and try to decipher the meaning of this word. As opposed to the number of prefixes [i]approaching[/i infinity (which is perfectly acceptable).
Wed Sep 24, 2008 5:23 pm UTC
Forum: Language/Linguistics
Topic: Infinitely long words?
Replies: 26
Views: 4078

### Re: Infinitely long words?

Yes, but the point of what he was saying is that one can hypothetically create infinitely long meaningful words. (he just used this one as an arbitrary example). This is what I am disputing.
Wed Sep 24, 2008 5:15 pm UTC
Forum: Mathematics
Topic: Method of finding sqaure roots
Replies: 7
Views: 1558

### Method of finding sqaure roots

While on a train trip earlier today, I was trying to calculate square roots of integers in my head. I decided to try a this procedure , and it seemed to work: Take the number you are square rooting, and find the largest square smaller than it, and the smallest square larger than i. eg 25<27<36. So o...
Wed Sep 24, 2008 4:27 pm UTC
Forum: Language/Linguistics
Topic: Infinitely long words?
Replies: 26
Views: 4078

### Infinitely long words?

Earlier this year, my LING1001 lecturer asked the rhetorical question "What is the longest word in the English language", paused and proceeded to answer it with the statement... "the longest word in the English language is actually infinitely long, because we can use double negatives ...
Wed Sep 24, 2008 3:43 pm UTC
Forum: Science
Topic: Is a programming language actually a language?
Replies: 43
Views: 4737

### Re: Is a programming language actually a language?

that last sentence should be:"as opposed to the difference arising from the language itself".
Wed Sep 24, 2008 3:40 pm UTC
Forum: Science
Topic: Is a programming language actually a language?
Replies: 43
Views: 4737

### Re: Is a programming language actually a language?

Programming is definitely not a language. It is more of a framework, an organizational system. It can be used to define rules for a language or for a logical system. In and of itself however, the commands carry little meaning. Think of it this way: if you follow a language down the abstraction ladd...
Wed Sep 24, 2008 3:01 pm UTC
Forum: General
Topic: How do you describe a feeling?
Replies: 12
Views: 1952

### Re: How do you describe a feeling?

Yeah awestruck. I get the same feeling looking up at the stars
Wed Sep 24, 2008 2:19 pm UTC
Forum: Science
Replies: 29
Views: 3936

For an ideal introduction to special relativity: "Space-time Physics"- By Wheeler

I also strongly recommend "physclips", a website with visual demonstrations and simulations of physics concepts
Wed Sep 24, 2008 2:10 pm UTC
Forum: Science
Topic: Is a programming language actually a language?
Replies: 43
Views: 4737

### Re: Is a programming language actually a language?

From the point of view that language is a means by which to communicate concepts (via the use of symbols-letters , numbers etc), I don't see the difference between a programming language and any other language. If I communicated in say C++ to another person, to carry out a particular intellectual ta...
Wed Sep 24, 2008 1:21 pm UTC
Forum: Mathematics
Replies: 72
Views: 5431

ah ok, I'm still a bit unclear and have a few questions: (i) Take an arbitrary real number, say 1, then think of the smallest real number which is larger than 1...is it 1.1?, or 1.01?, or 1.001?, or 1.0000000000000001? Or is it 1.(infinity of zeros)1? Hopefully after some thought you will realize th...
Wed Sep 24, 2008 12:07 pm UTC
Forum: Mathematics
Replies: 72
Views: 5431

ah ok, it seems I haven't completely understood why the reals constitute an uncountable infinity. Does density have anything to do with the reals being uncountably infinite? Or have I missed the point entirely?
Wed Sep 24, 2008 11:09 am UTC
Forum: Mathematics
Replies: 72
Views: 5431

Your argument there doesn't work at all. Since there is also no *rational* number that is closest to 1. And yet there's the same cardinality of rational numbers as there is of integers or whole numbers. Being dense is different from being complete. I disagree.....because between any two rationals t...
Wed Sep 24, 2008 10:44 am UTC
Forum: Mathematics
Replies: 72
Views: 5431

Be careful about saying things like this. The rational numbers are "continuous" in a sense. Between any two rationals is another rational. In fact, between every pair of rational numbers, there is an infinite number of rational numbers (in fact, a countably infinite). However, the rationa...
Wed Sep 24, 2008 3:29 am UTC
Forum: Mathematics
Replies: 72
Views: 5431

My calculus teacher told us to-day that there were different sizes of infinity since there were clearly more integers than whole numbers. This rather shocked me, as I had read somewhere that despite this they were actually the same size. Now I'm willing to accept what he says, since he has an excel...
Tue Sep 23, 2008 2:48 pm UTC
Forum: Science
Topic: Projective Geometry and Physics
Replies: 2
Views: 1145

### Projective Geometry and Physics

Does projective geometry have any role in theoretical physics?