Recent content by angy

Thank you so much!

Hi! Does anyone know where can I find the following thesis? M. Kyncl. Numerical solution of the three-dimensional compressible flow. Master’s thesis, Prague, 2011. Doctoral Thesis Thank you

Hi! I have the following problem: pt + (c2u)x + (c2v)y = 0 ut + (u2+p)x + (uv)y = α(uxx+uyy) vt + (uv)x + (v2+p)y = α(vxx+vyy) It is a formulation of the incompressible Navier-Stokes equations. I would like to know an exact solution. Can anyone help me? Thanks

Hi, I have the following problem. Consider an age-structured population growing according to a Leslie matrix. Suppose the population is in stable exponential growth, i.e. its age-structure is constant in time, while the total population is exponentially growing (or decreasing) with exponent...

I think you brightened my day! Therefore, it depends all on how I measure the speed the electron. If I don't know how the measurement is made, I can't say anything about the motion along an orthogonal axis.

Thanks a lot! Sorry, I still have a doubt. The fact that the electron is moving in x-direction means that the y-component of its velocity is zero, isn't it? Therefore, the uncertainty in velocity in y-direction is zero. The conclusion is that we can say anything about the position along...

Thanks, your explanation is very helpful. However, I still can't understand something. What if there is no slit? Maybe, is it not possibile otherwise to measure velocity in x-direction?

Hello! I have a doubt about Heisenberg uncertainty principle. Suppose that a particle moves along x-axis with a given uncertainty in velocity. Can I say something about its motion along y-axis? Thanks

Hi! Suppose we have a topological space X, a point x\in X and a homomorphism \rho:\pi(X,x) \rightarrow S_n with transitive image. Consider the subgroup H of \pi(X,x) consisting of those homotopy classes [\gamma] such that \rho([\gamma]) fixes the index 1\in \{1,\ldots,n\}. I know that H...

Thank you very very very much! If I can, I would like to ask another question... In my notes I wrote the following: let X be a topological space and let p:Y->X be a covering. Let p* be the induced homomorphism between the fundamental groups. Then Y can be constructed as the universal cover of X...

I can't understand how to recover a Riemann surface from the branch data. In particular, given a group acting on the Riemann sphere with some points removed, how can I construct a Riemann surface?