## Search found 59 matches

- Thu Oct 20, 2016 11:58 am UTC
- Forum: Mathematics
- Topic: Graph Theory Question
- Replies:
**1** - Views:
**1754**

### Graph Theory Question

Suppose that a graph is a maximal planar graph. Is it true that ,except for a finite number of exceptions, the complements of the maximal planar graphs have traceable connected components. Traceable = having a hamiltonian path. I've only a few counterexamples with a small number of vertices e.g 7. A...

- Wed Dec 11, 2013 12:20 am UTC
- Forum: Mathematics
- Topic: The Simple Collatz Representation Conjecture ?
- Replies:
**3** - Views:
**2123**

### Re: The Simple Collatz Representation Conjecture ?

I've also checked "Representing the integers with powers of 2 and 3" and there's a similar statement as the conjecture above but nothing like mine. I've also checked some other papers using keywords but nothing has popped up. Maybe that it's reworded differently in a more complex way which...

- Tue Dec 10, 2013 3:09 pm UTC
- Forum: Mathematics
- Topic: The Simple Collatz Representation Conjecture ?
- Replies:
**3** - Views:
**2123**

### Re: The Simple Collatz Representation Conjecture ?

The Dynamical System Generated by the 3n+1 Function ? I've checked it a while back and actually I saw a conjecture : Untitled.png However I haven't seen any explicit mention of the polynomials. It would be cool if someone could recheck though cos most of the stuff in the notes are advanced and out o...

- Mon Dec 09, 2013 11:06 pm UTC
- Forum: Mathematics
- Topic: The Simple Collatz Representation Conjecture ?
- Replies:
**3** - Views:
**2123**

### The Simple Collatz Representation Conjecture ?

I have just formulated a conjecture but I'm not sure whether it is already known and categorized. Please read it here and tell me what you think about it. http://www.scribd.com/doc/190387146/Collatz-Representation-Conjecture

- Tue Jul 05, 2011 4:41 pm UTC
- Forum: Hardware
- Topic: eBook Reader discussion
- Replies:
**1** - Views:
**947**

### eBook Reader discussion

Hi everybody. I'm considering buying an eBook reader but I just wanted to know if there's one which can display pdf and even djvu documents well and also wanted to know if eBook readers can display special and scientific characters and diagrams /images. Thanks for you response.

- Tue May 31, 2011 1:38 pm UTC
- Forum: Mathematics
- Topic: alternative mathematics
- Replies:
**128** - Views:
**13299**

### Re: alternative mathematics

Here's a link of a much complete version of his axioms http://www.math10.com/forum/viewtopic.php?f=1&t=431

. Most of it makes sense and is in fact nothing new except the real/ irrational bit which he still has to (try and won't be able to) prove .

. Most of it makes sense and is in fact nothing new except the real/ irrational bit which he still has to (try and won't be able to) prove .

- Mon May 30, 2011 2:04 pm UTC
- Forum: Mathematics
- Topic: alternative mathematics
- Replies:
**128** - Views:
**13299**

### Re: alternative mathematics

kumarevo wrote:The existing angles of 180 degrees, if you specify items may be quadrilateral, pentagon...

task. prove to be a real number result of division of two integers (a fraction)

BTW I have the impression that your posts are always incomplete...

- Fri May 27, 2011 3:41 pm UTC
- Forum: Mathematics
- Topic: alternative mathematics
- Replies:
**128** - Views:
**13299**

### Re: alternative mathematics

kumarevo wrote:Two axiom of mathematics - M.S. mathematicsMS.A-Natural alongMS.B-point

By the way what does "MS" mean?

- Wed May 25, 2011 8:31 pm UTC
- Forum: Mathematics
- Topic: alternative mathematics
- Replies:
**128** - Views:
**13299**

### Re: alternative mathematics

Seriously I would rep you if it was possible toKurushimi wrote:I will speak with very basic English. Kumavero, you speak bad English. Learn English. Post again later.

- Wed May 25, 2011 3:54 pm UTC
- Forum: Mathematics
- Topic: alternative mathematics
- Replies:
**128** - Views:
**13299**

### Re: alternative mathematics

Or maybe if he showed us a simple application of his maths in everyday life ( or even how to solve the original problem he posted in his earlier closed thread) maybe people would understand.

- Sun May 22, 2011 9:08 pm UTC
- Forum: Mathematics
- Topic: alternative mathematics
- Replies:
**128** - Views:
**13299**

### Re: alternative mathematics

I'm a sceptic but if you think you've found something quite significant, then publish it on arXiv.org http://arxiv.org/. It's " an archive for electronic preprints of scientific papers in the fields of mathematics, physics, astronomy, computer science, quantitative biology and statistics"....

- Fri May 06, 2011 7:56 pm UTC
- Forum: Mathematics
- Topic: About converging series, homework
- Replies:
**21** - Views:
**2309**

### Re: About converging series, homework

Does anyone know how to prove/disprove this: " If the series [imath]S_n=\sum a_n b_n[/imath] and [imath]\sum a_n[/imath] are convergent then [imath]\sum b_n[/imath] is convergent" . If ever it's true then there could be a simpler way to solve the problem.

- Fri May 06, 2011 3:22 pm UTC
- Forum: Mathematics
- Topic: About converging series, homework
- Replies:
**21** - Views:
**2309**

### Re: About converging series, homework

Series \sum_{n=1}^{\infty}{a_{n}b_{n}} converges with every sequence b_n , that lim_{n \rightarrow \infty}b_n=1 . Show that series \sum_{n=1}^{\infty}{a_{n}} converges absolutely. Does this mean : Show that if there is a sequence a_n such that for every sequence b_n converging to 1, \sum_{n=1}^{\in...

- Wed May 04, 2011 3:41 pm UTC
- Forum: Science
- Topic: Electrostatic Discharge
- Replies:
**7** - Views:
**1186**

### Re: Electrostatic Discharge

Well I know that it's my jacket supposedly made of cotton that's causing the electrostatic but what's troubling me is the magnitude of the static. It's been happening for quite a while and there's even a small 'crack' sound when I touch metals and it leaves a tingling sensation in my finger. I think...

- Wed May 04, 2011 11:58 am UTC
- Forum: Science
- Topic: Electrostatic Discharge
- Replies:
**7** - Views:
**1186**

### Electrostatic Discharge

Just wanted to know if it's normal to get an electric discharge after I take my jacket off and put my hands under running water and even hear a 'crack' sound when I touch a sponge?

- Thu Apr 28, 2011 2:32 pm UTC
- Forum: Logic Puzzles
- Topic: Tricky Box Problem
- Replies:
**26** - Views:
**5500**

### Re: Tricky Box Problem

Edit: I don't think that there's really any need for a proof. Since we are dealing with objects with similar symmetry like rectangular cuboids we just need to place the boxes such that their centre of mass (or symmetry) and the respective planes of symmetry coincide. If we have a configuration such ...

- Wed Apr 27, 2011 7:29 pm UTC
- Forum: Mathematics
- Topic: Jordan Normal Form
- Replies:
**7** - Views:
**1796**

### Re: Jordan Normal Form

Again sorry should read "basis vector" instead of "basis"

- Wed Apr 27, 2011 6:59 pm UTC
- Forum: Mathematics
- Topic: Jordan Normal Form
- Replies:
**7** - Views:
**1796**

### Re: Jordan Normal Form

Yeah sorry I meant nilpotent... And for some reason i think I missed an important step in finding the vectors of the matrix :? . First I start with \begin{pmatrix} 0 \\0 \\1 \end{pmatrix} which is a basis vector of Ker(A 3 ) and isn't in Ker(A 2 ) . Then I find \begin{pmatrix} 0 1 2\\0 0 1 \\0 0 0 \...

- Sat Apr 23, 2011 9:41 am UTC
- Forum: Mathematics
- Topic: Jordan Normal Form
- Replies:
**7** - Views:
**1796**

### Jordan Normal Form

I need some help for the Jordan Normal Form please. I understand that the Jordan Nomal form is of the form \left( {J_1\atop } { \atop } { \atop J_n} \right) where J_i is a Jordan block . And therefore the only possible non-zero entries are the diagonal and the superdiagonal(with 1's). But no...

- Fri Apr 08, 2011 8:19 am UTC
- Forum: Mathematics
- Topic: Math Books
- Replies:
**378** - Views:
**247353**

### Re: Math Books

Does anyone know a good LaTex book covering some basic stuff like text formatting, maths formatting, figures and drawing with TikZ?

- Fri Apr 01, 2011 7:44 am UTC
- Forum: Logic Puzzles
- Topic: FBI NEWS / decryption
- Replies:
**9** - Views:
**2648**

### Re: FBI NEWS / decryption

When I first looked at the code, I couldn't stop think about a scrabble letter-point cipher but I don't think it's it. But I still find it weird that the FBI were unable to unravel a code made by a simpleton. And they could have given more clues about the guy (e.g where he lives, his occupation, hob...

- Thu Mar 31, 2011 7:37 am UTC
- Forum: Logic Puzzles
- Topic: Elaborate bike locks
- Replies:
**13** - Views:
**3824**

### Re: Elaborate bike locks

Maybe t h e r e could be a better configuration after all ...

**Spoiler:**

- Wed Mar 30, 2011 3:57 pm UTC
- Forum: Logic Puzzles
- Topic: Elaborate bike locks
- Replies:
**13** - Views:
**3824**

### Re: Elaborate bike locks

That's very good. Somehow I thought that it would be impossible with only 3 loops. I guess there's no better configuration and I hope I'm right this time .

- Wed Mar 30, 2011 8:19 am UTC
- Forum: Logic Puzzles
- Topic: Elaborate bike locks
- Replies:
**13** - Views:
**3824**

### Re: Elaborate bike locks

I found another variation but wasn't able to draw it well so disregard loop 2 and instead imagine the 3 black loops in the middle inter-locked with each other. Loop 1 was the hardest bit of course: it prevents the whole thing from opening up when the lock on the left is opened and at the same time i...

- Tue Mar 29, 2011 8:25 am UTC
- Forum: Logic Puzzles
- Topic: The surprise exam paradox
- Replies:
**217** - Views:
**62882**

### Re: The surprise exam paradox

Here's my second attempt to the problem: The students should just imagine the week as the Venn diagram below: http://i.picasion.com/pic39/83aab8a2052d94cf4216223cf8d4400c.gif If there is no exam from Mon to Thurs this implies that elements Mon to Thurs are in B. Fri can't be in B because the stu...

- Mon Mar 28, 2011 11:30 am UTC
- Forum: Logic Puzzles
- Topic: Partitioning A Formula
- Replies:
**10** - Views:
**2500**

### Partitioning A Formula

It's a problem I've created and I'm not sure if it's solvable or not but I'll share it anyways: "A man has discovered an important formula but knowing the whole formula endangers his life cos he can get kidnapped etc... Therefore the man decides to divide his work into 5 parts A, B , C, D and E...

- Fri Mar 25, 2011 9:43 pm UTC
- Forum: Logic Puzzles
- Topic: Unsolvable Logic Problem!
- Replies:
**11** - Views:
**5630**

### Re: Unsolvable Logic Problem!

Well at first I thought it was braille cos they weren't using the 3rd column but no good. Also I also seem to see a swastika pattern but yeah this puzzle is one of the hardest I've seen (even having finished puzzle books) ...

- Thu Mar 24, 2011 10:30 am UTC
- Forum: Logic Puzzles
- Topic: The surprise exam paradox
- Replies:
**217** - Views:
**62882**

### Re: The surprise exam paradox

Well in my opinion the students' reasoning is erroneous: STEP 1 : \text{if there is an exam on Friday }\Rightarrow \text{*there was no exam on any day before}\Rightarrow \text{exam can be predicted to be on Friday} \Rightarrow \text{no exam on Friday } which is correct Now using the professor's stat...

- Tue Mar 22, 2011 3:49 pm UTC
- Forum: Mathematics
- Topic: Combination Problem
- Replies:
**10** - Views:
**2578**

### Re: Combination Problem

In fact there was a small mistake in the formula which I corrected and I managed to solve \Big\lgroup\sum_{l=0}^{30}\Big\lgroup \sum_{k=0}^{l} \Big\lgroup\sum_{j=0}^{k} \Big\lgroup\sum_{i=0}^{j}\Big\lgroup\sum_{1}^{i}x\Big\rgroup \Big\rgroup \Big\rgroup \Big\rgroup \Big\rgroup = {1\over 120} \sum_{l...

- Mon Mar 21, 2011 6:49 pm UTC
- Forum: Mathematics
- Topic: Combination Problem
- Replies:
**10** - Views:
**2578**

### Re: Combination Problem

Yep thanks a lot guys. Feel so stupid I didnt think of the separator/ empty space method . And it even becomes easy to solve for cases such as only 2 consecutive numbers, only 3 consecutive numbers etc...

- Mon Mar 21, 2011 2:12 pm UTC
- Forum: Mathematics
- Topic: Combination Problem
- Replies:
**10** - Views:
**2578**

### Re: Combination Problem

theorigamist wrote:To clarify: no consecutive numbers rules out 123456, but are you also ruling out 654321?

Yep cos i'm only looking for combinations and not permutations.

- Mon Mar 21, 2011 12:54 pm UTC
- Forum: Mathematics
- Topic: Combination Problem
- Replies:
**10** - Views:
**2578**

### Combination Problem

Just wondering if there is a simple way of computing this problem: How many different 6 number combinations from numbers 1 to 40 can I make such that there are no consecutive numbers? I found something but I cant calculate it's value \Big\lgroup\sum_{l=0}^{30}\Big\lgroup \sum_{k=0}^{l} \Big\lgroup\s...

- Tue Sep 28, 2010 12:23 pm UTC
- Forum: Coding
- Topic: Compile using Turbo C
- Replies:
**8** - Views:
**1366**

### Compile using Turbo C

Hi everybody. I'm new to programming and just wanted to know how to compile a program i've written in notepad using the command prompt in Windows.(i've got Turbo C as compiler btw)

- Wed Jun 16, 2010 1:09 pm UTC
- Forum: Mathematics
- Topic: A facebook joke.
- Replies:
**13** - Views:
**2616**

### Re: A facebook joke.

Hey you owe me a minute of my life!!!!

- Thu Jun 03, 2010 6:41 pm UTC
- Forum: Logic Puzzles
- Topic: Not as easy as 1 2 3
- Replies:
**56** - Views:
**13619**

### Re: Not as easy as 1 2 3

Your number is N Q1 : Minus 1 from your number and take the quotient by 3. Now multiply the result with a random number that I have chosen between 1 and 3. Is the result greater than 1? No(1,2,3) Yes(7,8,9) I don't know (4,5,6) Q2: I take the remainder of N / 3 and I mul...

- Mon May 31, 2010 6:33 am UTC
- Forum: Logic Puzzles
- Topic: How to confirm if someone is your "future you"?
- Replies:
**96** - Views:
**14094**

### Re: How to confirm if someone is your "future you"?

Ok a really crazy answer to a crazy question ... I start stabbing myself... if the dude's doesnt get any new scars it means he's not me

- Mon May 31, 2010 6:28 am UTC
- Forum: Logic Puzzles
- Topic: Truth or Lie?
- Replies:
**8** - Views:
**2348**

### Re: Truth or Lie?

Person 1 will always claim to be from clan A , so if Person 2 answers A he's telling the truth and is from A or else Person 2 is from B. And from there you can verify where Person 3 comes from and then Person 1... P.S Person 2 can repeat the opposite of what he heard if he's a liar :twisted:

- Sun May 30, 2010 7:55 pm UTC
- Forum: Logic Puzzles
- Topic: Truth or Lie?
- Replies:
**8** - Views:
**2348**

### Truth or Lie?

Hi everybody. Just wanted to share a small puzzle with you. " I'm making my way in the Amazonian jungle and I come across three persons who either come from Clan A ( always speak the truth) or the Clan B ( always lie) . I ask them from which clan the come from : the first answers me but for som...

- Wed May 12, 2010 9:54 am UTC
- Forum: Mathematics
- Topic: Change of basis (Matrix and operator)
- Replies:
**6** - Views:
**1363**

### Change of basis (Matrix and operator)

Hi everybody. I've been studying vector spaces for a few weeks and we're now doing change of basis but I keep getting the matrix and operators wrong. So can someone please explain the new basis/ old basis thing clearly please?

- Mon Apr 05, 2010 9:29 am UTC
- Forum: Mathematics
- Topic: Absolute value of ( x-y)
- Replies:
**3** - Views:
**1238**

### Absolute value of ( x-y)

Hi everybody. I'm working on a proof and I want to get a relation between |x-y| and |x|-|y| but in many books I see the relation ||x|-|y||<=|x-y|<=|x|+|y| and although I understand why there is ||x|-|y|| I dont know what i should do to get a relation between |x-y| and |x|-|y|. Thanks for your help.