I want to know of there already exists a name for this. Let u and v be scalar functions defined on a open set in R^3 such that, *for every point* in this open set: i)...

I decided to crosspost this since I give a fairly rigorous derivation in one case. *** rD wrote: "Spoonfed" wrote in message ...

Hi all, I am trying to apply PID control on the yaw, pitch and roll angles of my aircraft to keep it in a desired orientation. However, this orientation is for a pitch...

Arnold Neumaier wrote: I am looking for an explanation why a particular detector coupled to a particular quantum system produces the observed erratic but ...

Does anybody know the origin of the word Dilaton, i.e. why it was called like this? Rene

For a course on a classical mechanics I decided to have my students work out the geodesics on a 5-dimensional manifold M x U(1) with the metric h given by h_{ij} =...

"Arnold Neumaier" wrote in message ... Joe Rongen wrote: Arnold Neumaier wrote: I am...

http://xxx.lanl.gov/abs/quant-ph/0505204 David McAnally wrote: In fact, no matter what the state of the m+2 photons is, the probability that the message receiver will...

We will presume that magnetic monopoles exist and call the negative monopole a Stron, and the positive monopole a Ntron. Strons will be attracted to Ntrons. Strons will be...

**In*the*microcanonical*ensemble,*one*assumes*that*all*microstates*with*the same energy have the same probability. Following Jaynes, this hypothesis is the best choice when...

Dear Members, I don't know how Sakurai has driven the last identity 1.4.6 about expectation value: A= SIGMA_a' SIGMA_a" al|a"a"|A|a'a'|al= SIGMA_a' a'...

I start with Clifford's Dream to Einstein's Vision according to John A. Wheeler. "small portions of space are in fact ... analogous to little hills on a surface which is...

Hello, Given a complete manifold X, Let d be the de Rham operator and A a 1 form (with value in R). The magnetic laplacian is defined as \Delta_A=(d+iA)*(d+iA). In the...

In quantum mechanics it is customary to talk about Hilbert spaces and even rigged Hilbert spaces as the requisite spaces for all of the functions to inhabit. With rigged...

Does it make any sense to talk about complex vectors in physics? A wavefunction is usually complex, and wavefunctions can be thought of as vectors (I think). So does that...

wrote: Arnold Neumaier wrote: So, the essential physical content (the part that's common to all ways of reading the operator) is the set of...

What reasons do we have to believe that we need to quantise gravity? Has anyone done any work akin to Bohr and Rosenfeld on the observability status of spacetime curvature?

Also available as http://math.ucr.edu/home/baez/week217.html May 30, 2005 This Week's Finds in Mathematical Physics - Week 217 John Baez Last week I described lots of...

Has any work been done superimposing disparate swaths of sky to look for identical, simultaneous signals?

i am wondering whether 1- there is a lower limit for short photon wavelength, or what would happen to the photon as it continually gets more energetic. will it sponatenously...