## Search found 47 matches

- Fri Oct 29, 2010 4:05 pm UTC
- Forum: Mathematics
- Topic: hard geometry homework problem
- Replies:
**7** - Views:
**2830**

### Re: hard geometry homework problem

Using sphereical geometry is not an option. Geodetic latitude is not measured from the origin, so the conversion will be way off. I resorted to Vincinty's algorithm and root finding.

- Thu Oct 28, 2010 9:52 pm UTC
- Forum: Mathematics
- Topic: hard geometry homework problem
- Replies:
**7** - Views:
**2830**

### hard geometry homework problem

There are 3 points, A B and C on WGS84, all given by Geodetic latitude and longitude; through A and B there is a geodesic. I need to find the following:

1. The shortest distance from C to the geodesic. This intersects the geodesic at a point D.

2. The distance from the point A to point D

1. The shortest distance from C to the geodesic. This intersects the geodesic at a point D.

2. The distance from the point A to point D

- Thu Jun 17, 2010 11:14 pm UTC
- Forum: Computer Science
- Topic: Integration Algorithm
- Replies:
**10** - Views:
**3088**

### Re: Integration Algorithm

For functions in certain classes, the problem of determining whether the indefinite integral of a function is also in the class is an undecidable problem. I would make your calculator just find the Laurent series of the function and then integrate that.

- Wed Jun 02, 2010 12:24 am UTC
- Forum: Mathematics
- Topic: "Special" four digit number
- Replies:
**26** - Views:
**8982**

### Re: "Special" four digit number

what are you writing about and are you trying to get it published?

- Wed Jun 02, 2010 12:22 am UTC
- Forum: Mathematics
- Topic: Math discovered or invented?
- Replies:
**110** - Views:
**18234**

### Re: Math discovered or invented?

Is it safe to say the axioms are invented and the theorems and proofs are discovered? I dont think natural numbers exist outside of human experience (or the experiences other highly intelligent beings that can define numbers). Do other forms of life experience the natural numbers? What about jelly f...

- Tue Jun 01, 2010 9:11 pm UTC
- Forum: Computer Science
- Topic: Thoughts on P = NP
- Replies:
**32** - Views:
**8082**

### Re: Thoughts on P = NP

Well you can always remove the axiom of infinity

- Tue Jun 01, 2010 4:45 am UTC
- Forum: Computer Science
- Topic: Thoughts on P = NP
- Replies:
**32** - Views:
**8082**

### Re: Thoughts on P = NP

yeah thats what i meant

- Tue Jun 01, 2010 3:56 am UTC
- Forum: Science
- Topic: Is doing physics satisfying?
- Replies:
**13** - Views:
**2817**

### Re: Is doing physics satisfying?

I suggest looking into DoD jobs, they are constantly looking for math/physics/cs/ee

- Tue Jun 01, 2010 3:53 am UTC
- Forum: News & Articles
- Topic: Israelian raid on Gaza-bound aid ship kills 10+ people
- Replies:
**601** - Views:
**51177**

### Re: Israelian raid on Gaza-bound aid ship kills 10+ people

I think I speak for everyone by responding to this development with a hearty FFFFFFFFFFFFFFFFFFFFFFFUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUU!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! Seriously, can we not have a fucking war break out every fucking year!? Are you kidding? Having a war break out would be great for t...

- Tue Jun 01, 2010 3:45 am UTC
- Forum: News & Articles
- Topic: Tight pants ban takes effect in Indonesia's Aceh
- Replies:
**42** - Views:
**6682**

### Re: Tight pants ban takes effect in Indonesia's Aceh

We see you trollin'. We hatin'.

- Tue Jun 01, 2010 3:30 am UTC
- Forum: Computer Science
- Topic: Thoughts on P = NP
- Replies:
**32** - Views:
**8082**

### Re: Thoughts on P = NP

Is this a troll post? lol yeah kinda. but it was half seious. Cantor spent most of his life going back and forth trying to prove if 2^{\aleph_0} = c is true or not. He died years before people figured out it was undecidable. I really just wanted to bring up the point that everyone discusses the con...

- Mon May 31, 2010 8:55 pm UTC
- Forum: News & Articles
- Topic: Israelian raid on Gaza-bound aid ship kills 10+ people
- Replies:
**601** - Views:
**51177**

- Mon May 31, 2010 8:24 pm UTC
- Forum: News & Articles
- Topic: Israelian raid on Gaza-bound aid ship kills 10+ people
- Replies:
**601** - Views:
**51177**

### Re: Israelian raid on Gaza-bound aid ship kills 10+ people

make me want to come through the screen a punch the people who made them. While the activists may have attacked the Israeli soldiers first (and for me that is a big may), the blame for killing ten people does lie with the soldiers. If they were unprepared for crowd control of the boats then procedu...

- Mon May 31, 2010 6:09 am UTC
- Forum: Individual XKCD Comic Threads
- Topic: 0747: "Geeks and Nerds"
- Replies:
**130** - Views:
**36911**

### Re: "Geeks and Nerds" Discussion

Is there something like Russell's Paradox going on there? If nobody believed there was a difference between geeks and nerds, that intersection would be empty, therefore the sets would be distinct! My head hurts. this implies that the axioms on which the cartoon rests are inconsistent => http://xkcd...

- Mon May 31, 2010 5:59 am UTC
- Forum: Mathematics
- Topic: Cardinality of uncomputable numbers
- Replies:
**48** - Views:
**6165**

### Re: Cardinality of uncomputable numbers

i thought ordinals are countable. an ordinal is just the set of all ordinals preceding it right?

- Mon May 31, 2010 3:55 am UTC
- Forum: News & Articles
- Topic: North Korea threatens 'all-out war'
- Replies:
**184** - Views:
**22159**

### Re: North Korea threatens 'all-out war'

All north korea does is do stuff to piss the world off, then they get paid by the UN (aka the united state's money) to not do it again. The government keeps the money for itself, so its people are suffering, so they get even more aid. By constantly misbehaving, the keep the grounds that we have to p...

- Mon May 31, 2010 3:42 am UTC
- Forum: Mathematics
- Topic: Math discovered or invented?
- Replies:
**110** - Views:
**18234**

### Re: Math discovered or invented?

I can define a unicorn pretty well, and it is clearly based off of external phenomenon that plenty of humans encounter at some point in their lives. Did I discover or did I invent the "unicorn"? No one has ever seen a unicorn. A similar task would be to define numbers. If they are not inve...

- Mon May 31, 2010 3:04 am UTC
- Forum: Mathematics
- Topic: Cardinality of uncomputable numbers
- Replies:
**48** - Views:
**6165**

### Re: Cardinality of uncomputable numbers

Aren't there models of set theory where every set is measurable? ie they don't use AC Edit: they use axiom of depended choice (ADC) and axiom of Determinacy(AD) if so then we wouldn't have ZF + ADC + AD => AX => ¬CH, so using a weaker form of axiom of choice and somehthing called the axiom of Determ...

- Mon May 31, 2010 2:57 am UTC
- Forum: Computer Science
- Topic: What would you do with an infinitely fast computer?
- Replies:
**818** - Views:
**228305**

### Re: What would you do with an infinitely fast computer?

I'd assume it solves the halting problem (on non-infinitely fast computers), which isn't a paradox. So I'd write a simple proof checker and proof generator in a sufficiently powerful system. Then I'd write the 'is provable' program, that (if something is provable) it (tells me how long the shortest...

- Mon May 31, 2010 2:29 am UTC
- Forum: Mathematics
- Topic: Most interesting mathematician?
- Replies:
**35** - Views:
**5223**

### Re: Most interesting mathematician?

ConMan wrote: You couldn't make a movie of his life because no-one would believe it.

Watch "N is a Number"

- Mon May 31, 2010 2:25 am UTC
- Forum: Gaming
- Topic: If you could combine two(or more) games
- Replies:
**228** - Views:
**65696**

### Re: If you could combine two(or more) games

Shenmue + Grand theft auto = best game ever

Majoras Mask + Fable = (as a zelda game) Kill the stupid townsfolk till you become fierce deity

Smash bros 64 + Final fantasy V, VI, VII, VIII

Smash bros 64 - current characters + all pokemon = pokemon smash

Majoras Mask + Fable = (as a zelda game) Kill the stupid townsfolk till you become fierce deity

Smash bros 64 + Final fantasy V, VI, VII, VIII

Smash bros 64 - current characters + all pokemon = pokemon smash

- Mon May 31, 2010 2:08 am UTC
- Forum: Mathematics
- Topic: "Special" four digit number
- Replies:
**26** - Views:
**8982**

### Re: "Special" four digit number

You might be able to use the number of symmetries of some regular 4D polygon. The largest one, the 600 cell has 14400 symmetires, so the smaller ones will have less. Find out how many symmetries are in the 24-cell since the 24-cell looks really cool.

- Mon May 31, 2010 1:56 am UTC
- Forum: Mathematics
- Topic: Cardinality of uncomputable numbers
- Replies:
**48** - Views:
**6165**

### Re: Cardinality of uncomputable numbers

i thought AC and AX were representing the same thing

- Mon May 31, 2010 1:52 am UTC
- Forum: Computer Science
- Topic: Thoughts on P = NP
- Replies:
**32** - Views:
**8082**

### Re: Thoughts on P = NP

LOL you computer scientists; isn't it obvious? P = NP is undecidable à la continuum hypothesis Seriously why hasn't anyone tried to show this yet? Now have a blast figuring out the implications of what I just asserted. And the best part is, since no one has settled the question, it has an equal prob...

- Mon May 31, 2010 1:35 am UTC
- Forum: Mathematics
- Topic: Cardinality of uncomputable numbers
- Replies:
**48** - Views:
**6165**

### Re: Cardinality of uncomputable numbers

Interesting. Granted I have no formal training in set theory, but how could AX not be true? It lead to pathological results like sets of reals that are not lebesgue measurable, which gives us more pathological results like being able to cut up a grape and put it back together so that it is the size...

- Sun May 30, 2010 6:50 pm UTC
- Forum: Site/Forum issues
- Topic: P, NP, P = NP, P vs NP, etc
- Replies:
**2** - Views:
**1558**

### P, NP, P = NP, P vs NP, etc

The following words in your search query were ignored because they are too common words: p vs np.

You must specify at least one word to search for. Each word must consist of at least 3 characters and must not contain more than 14 characters excluding wildcards.

wtf

You must specify at least one word to search for. Each word must consist of at least 3 characters and must not contain more than 14 characters excluding wildcards.

wtf

- Sun May 30, 2010 6:38 pm UTC
- Forum: Mathematics
- Topic: Cardinality of uncomputable numbers
- Replies:
**48** - Views:
**6165**

### Re: Cardinality of uncomputable numbers

Alright so we know that the CH is independent of ZFC. If I were to adopt another axiom that is weaker than CH (ie you cant add CH or generalized CH), call it X, then can we prove/disprove CH within ZFC + X? How many axioms do we have to append to make CH provable or disprovable? The answer to this q...

- Sun May 30, 2010 6:27 pm UTC
- Forum: Mathematics
- Topic: How to become a math professor?
- Replies:
**25** - Views:
**5611**

### Re: How to become a math professor?

Get a Phd. Also, look at what school you want to get your PhD from and see what their requirements are. I suggest starting to learn German and French or Russian now.

- Sun May 30, 2010 6:18 pm UTC
- Forum: Mathematics
- Topic: Math discovered or invented?
- Replies:
**110** - Views:
**18234**

### Re: Math discovered or invented?

There can be various reasons the truthhood cannot be determined. For example, lets take God's existance to be an axiom. This cannot be proven because belief in God must be based on FAITH and if his existence was proven then people wouldn't need to have faith in his existence. The axiom can't be dis...

- Sun May 30, 2010 4:30 pm UTC
- Forum: Mathematics
- Topic: Math discovered or invented?
- Replies:
**110** - Views:
**18234**

### Re: Math discovered or invented?

PDEs aree amazing at predicting and describing the behavior of all kinds of phenomena. Take the Naiver-Stokes equations for example. Fluids at the scales we observe them appear to be a continuous medium, though we know that they are made up of very tiny discrete particles, which is why naiver stokes...

- Sun May 30, 2010 5:04 am UTC
- Forum: Mathematics
- Topic: Self Teaching PDE's?
- Replies:
**5** - Views:
**1460**

### Re: Self Teaching PDE's?

If you want a theoretical approach, read Partial Differential Equations by Lawrence Evans

- Sun May 30, 2010 4:47 am UTC
- Forum: Mathematics
- Topic: 2^n subsets
- Replies:
**8** - Views:
**2794**

- Sun May 30, 2010 4:42 am UTC
- Forum: Mathematics
- Topic: From Logic to Math
- Replies:
**4** - Views:
**1294**

### Re: From Logic to Math

Set Theory and Logic by Stoll is a great self contained introductory text that I recommend reading asap so you know what you are getting into

- Sun May 30, 2010 4:38 am UTC
- Forum: Mathematics
- Topic: Famous Math Quotes!
- Replies:
**32** - Views:
**8138**

### Re: Famous Math Quotes!

orangeperson wrote:"The above proposition [2+2=4] is occasionally useful."

-Principia Mathematica

Pretty sure its 1+1 = 2

"Math puns are the first sine of madness"

- Sun May 30, 2010 4:33 am UTC
- Forum: Science
- Topic: Miscellaneous Science Questions
- Replies:
**2962** - Views:
**730023**

### Re: RELATIVITY QUESTIONS! (and other common queries)

Sorry I didnt feel like reading this whole thread. I mean the time on my watch. To make the problem more fun lets say My watch is a photon that bounces between two parallel mirrors a meter apart. The photon bounces orthogonal to the direction i am moving in. This is what I see. mirror1________ photo...

- Sun May 30, 2010 4:25 am UTC
- Forum: Mathematics
- Topic: Cardinality of uncomputable numbers
- Replies:
**48** - Views:
**6165**

- Sun May 30, 2010 4:16 am UTC
- Forum: Mathematics
- Topic: Cardinality of uncomputable numbers
- Replies:
**48** - Views:
**6165**

### Re: Cardinality of uncomputable numbers

gmalivuk wrote:What? No it certainly doesn't.Cmebeh wrote:Wrong. In ZF, CH => Axiom of Choice.

LOL i was wrong; ZF + Generalized continuum hypothesis => Axiom of Choice

- Sun May 30, 2010 4:11 am UTC
- Forum: Mathematics
- Topic: Most interesting mathematician?
- Replies:
**35** - Views:
**5223**

### Re: Most interesting mathematician?

If you are going to do turing then you have to do church, since they pretty much did the same thing in mathematics. Turing spent too much of his time doing useful stuff like building the first computers and breaking the german code etc.

- Sun May 30, 2010 4:05 am UTC
- Forum: Mathematics
- Topic: Math Movies
- Replies:
**3** - Views:
**1215**

### Math Movies

http://www.dimensions-math.org/Dim_reg_E.htm (go download jenn3d if you wanna explore 4d on your own)

http://video.google.com/videoplay?docid ... 068380459# Cantor and Godel kick ass

http://video.google.com/videoplay?docid ... 068380459# Cantor and Godel kick ass

- Sun May 30, 2010 3:59 am UTC
- Forum: Mathematics
- Topic: Math discovered or invented?
- Replies:
**110** - Views:
**18234**

### Re: Math discovered or invented?

Besides, its only true to say that space is generally non-Euclidean. There are places where space has negative curvature and places where it has positive curvature, and since space is continuous this means that there must also be boundary regions (even if they're infintesimally narrow) where space ...