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**1. Homework Statement**

IF we consider electrons in a crystal subject to a magnetic field. The electrons near the fermi energy wil obey open or closed orbits.

Using semiclassical eqn of motion and band structure for a bravais lattice, discuss the behavour and derive all conserved quantities.

**2. Homework Equations**

hbar * dk/dt = -q(1/c * v x B )

**3. The Attempt at a Solution**

I have no idea which bravais lattice would be ideal for this problem.