Recent content by sheelbe999

@stephen an anologous problem would be z = f(x_1,x_2,...x_N) find local and global minima maxima for z. the issue is I don't know the form of f. @chiro thanks for your detailed response. I don't want to enforce differentiability, I think the surface is likely very discontinuous. How...

Here's the problem I'm trying to solve, We have an N dimensional surface. We do not know the form of this surface however we have datapoints which are likely to be close, though not guaranteed to be on the surface, with some outliers. What I want to do is determine where in N dimensional...

Wow! thank you so much for such helpful responses! Problem solved! :)

So I am reading a book on ferromagnetism, the author writes \left[S_J,S_{J-1} \cdot S_J\right] = S_J cross S_{J-1} (I couldn't get the cross product x in latex code for some reason) Where [tex]S_J[\tex] and [tex]S_{J-1}[\tex] are the spin operators for atoms j and j-1. I was...

Homework Statement I'm really struggling with this one guys, the question is: Explain why a particle which is in an energy eigenstate cannot be moving in the classical sense. Homework Equations I'm guessing the TISE and TDSE are relevant The Attempt at a Solution

thanks and will move it henry

I'm really struggling with this one guys, the question is: Explain why a particle which is in an energy eigenstate cannot be moving in the classical sense.

How is it best to model Helium gas, Ideal gas equation? Dieterici? Van der Waals? some other equation? Also if it is dieterici or van der waals,what the values of a and b, the constants in the equation of state.

Massively stuck with this one, have done some reading and am having difficulty connecting matrices to vector spaces (a) Verify that the space of the real (2 x 2)-matrices, endowed with the standard addition and multiplication by real scalars, forms a vector space (b) Specify a basis for...

Homework Statement "A snowball, initially of mass m, slides down a slope inclined at an angle φ with respect to the horizontal. As it moves, the mass of additional snow Δm = αx that it accumulates is proportional to the distance traveled x. Write the differential equation of translational...

ah, that is a really good way of explaining it, thank you very much to all of you

Sorry your right i ment electron-positron so is the fact that there is only one vertex on the diagram a sufficiently strong answer?

Homework Statement As in the title Why can an electron - antiproton pair not be created by a photon in free space? This question came up last term but our tutor told us that it is because there are "no stimuli", I'm sure there is a better answer than this. I seem to recall that it can...