Math

The Center of Mass of all Rational Numbers
At some point of the physicsforums' thread: http://www.physicsforums.com/showthread.php?t=403024 I posed some thoughts about what I call the "Center of Mass" of all rational numbers = 3/2, and asked for some previous papers or books relating specifically this subject. Arithmetic mean of all rational numbers =... 16 May 2010 22:21

JSH
is doa ... 16 May 2010 20:08

This is an approximation algorithm for SET-Cover. This algorithmruns in po
This is an approximation algorithm for SET-Cover. This algorithm runs in polynomial time. // Algorithm SetCoverApprox(S): // Input: A collection S of sets S1, S2,....,Sm whose union is U // Output: A small set cover C for S // C <- 0 {The set cover we arer building} // E <- 0 ... 16 May 2010 19:02

At the extreme of gravity there is a limit
Einstein said gravity is acceleration equivalent. Therefore the force of gravity has a limit of a less than light speed acceleration. There are no black holes only neutron stars. Mitch Raemsch ... 19 May 2010 14:55

Cycle phase extraction
Hi, Can you suggest any robust cycle phase extraction algorithm? I have a signal, which contains sinus signal (assume, we know the period of sinus). How to determine its phase? The problems are that the signal may contain strong trends as well as gaps. The former makes it impossible to do simple correlation ... 17 May 2010 06:57

Distortion estimates & dynamical systems
Hi, In the context of 1D dynamical system, what is a "distortion estimate"? Is there a source (at a beginning math grad level) that explains what it is? Thank-you very much, Peter ... 16 May 2010 13:32

sierpinski constant for x^4 ?
is there a kind of sierpinski constant for 4th powers ? closed form solutions of course !! like lim sum 1/(a^4 + b^4) = closed form constant. or lim sum 1/(a^4 + b^4 + ..k times ) - closed form function of n with n =< a^4 + b^4 + ... = closed form constant. or maybe a kind of ramanujan constant for 4th powe... 18 May 2010 17:02

Tree Traversal
Given a preorder traversal string of a tree, how many trees can be constructed? Is there any bound for this? ... 16 May 2010 13:32

Chapt9; Telescope best distance tool and if Doppler redshift were true, then Great Wall gets fuzzier #90; ATOM TOTALITY
Archimedes Plutonium wrote: (snipped) III. Observational and experimental support (9) Telescope as distance tool and upper limit of telescope in distance is about 400 million light years (10) experiment that shows us what the redshift truly is-- curvature of the lobes of an Atom Totality (... 16 May 2010 13:32

My pet chimp has lice and crotch itch. Can anyone help?
Pentcho Valev wrote: ETHERISTS: http://www.eng.uwi.tt/depts/elec/staff/sgift/special_relativity.pdf The Invalidation of a Sacred Principle of Modern Physics Stephan J.G. Gift "The principle underpinning modern physics, which states that the speed of light is constant and independent of the motion ... 16 May 2010 11:21