Conductivity of metals at 0 kelvin?

[DrDu]

It can be different from zero (with a degenerate ground-state), but it does not have to.

I don't think there are actual thermodynamical systems whose true ground state is degenerate. Usually at sufficiently low temperatures some very weak interactions break the degeneracy.

 

[mfb]

That is true. I just keep track of that special case as it is not forbidden.

 

[andrien]

It is possible to calculate that all physical wavefunctions satisfy the (p,x)-uncertainty principle. This is related to the mathematics of Fourier transformations. Alternatively, it is possible to derive it in a pure algebraic way as well.

every one knows that.

Source?

It been time.I think it was written in vol. 1 of his and early chapters.

 

[psmt]

I think it was written in vol. 1 of his and early chapters.

If you could provide a page number, chapter number or something like that that would be helpful, but either way I'm going to check this out when i next visit a suitable library, because i would have expected better of Feynman!

 

[psmt]

i would have expected better of Feynman!

He was unambiguously referring to zero point energy, not entropy.