Math

most likely candidate arc of tractrix and circle that are equal (proofs??) #402 Correcting Math
gudi wrote: Hi Archimedes Plutonium, Without differential geometry basics I am afraid you cannot progress much in obtaining a satisfying answers for your questions. Just as surfaces in flat Euclidean geometry are developable and can be made to contact everywhere, in doubly curved geometry... 7 Feb 2010 17:36

What is the Last Digit of PI? - When ends Eternity?!
Datesfat Chicks wrote: I have a friend who claims that the last digit of PI is "7". Is this correct? Thanks, Datesfat Maybe PI indeed ends with "7". Please read carefully what is told about Repeating Eternities at my web page at http://www.xs4all.nl/~jemebius/Everyicon.htm , and just observe some... 6 Feb 2010 20:44

Difference between the simplex category (Δ)and the opposite simplex category
Hi, Sorry, but I am not completely following. Using your example, consider the morphism 0 -> 0, 1 -> 2 from (1) -> (2) in Δ. Exactly which would the associated opposite morphism (2) -> (1) be in Δ^op? Thank you. On Sat, 06 Feb 2010 04:23:05 -0800, victor_meldrew_666(a)yahoo.co.uk wrote: On 5 Feb, 20:07,... 6 Feb 2010 08:34

sphere & pseudosphere maximum Surface area Contact? Is it 10% #393 Correcting Math
Archimedes Plutonium wrote: Alright, I have to retrench somewhat here. Looking at Mathworld's pseudosphere and funnel equations, that the contact nested inside is a line contact and not area. So I have to retrench the model and operation. What I do is cut the sphere into half and then cut a ... 6 Feb 2010 11:52

Ngo's proof of the fundamental lemma
"Marko Amnell" <marko.amnell(a)kolumbus.fi> wrote in message 7om21gF3p8pi0U1(a)mid.individual.net... Ngo Bao Chau's proof of the fundamental lemma was picked by Time magazine as one of the Top 10 Scientific Discoveries of 2009. http://www.time.com/time/specials/packages/article/0,28804,1945379_1944416_1944435,... 6 Feb 2010 01:03

Representation of rationals as sums of distinct reciprocals
Proof or counterexample, please: Every rational between 0 and 1 can be written as a sum of reciprocals of distinct positive integers. If the fractions are sorted in increasing denominator order, this representation is unique. For example: 131/483=1/3+1/7+1/483. DISCLAIMER: I am not a student, just interested i... 5 Feb 2010 17:20

20 Days
20 days since Martin Luther Day on January 15. ... 13 Mar 2010 23:05

10 Days
10 days to Valentine's Day on February 14. ... 4 Feb 2010 20:15

Game" Numbers To Number
This is a game for 2 players. Needed: 3 blank pieces of paper, one for each player and one common piece of paper. 2 pens/pencils, one for each player. Let m be an integer decided on by both players. m should probably be = 6. Players also decide who is player 1 and who is player 2 at the beginning of the game. ... 4 Feb 2010 14:35

JSH: Negitive Square Roots - a myth or not?
Hey JSH Watch and learn about negitive square roots! You get so confused about it! That is so Funny! two ways to get to positive 9 http://www.youtube.com/watch?v=Cz-a8_0Mg2U How that is possable; http://www.youtube.com/watch?v=M_Vkh1ffpEQ Square root of -1 explaned http://www.youtube.com/watch?v=L... 4 Feb 2010 13:28