# Relativistic magnetic interactions from non-orthogonal basis sets

# TODO

[x] Definition of magnetic entities:
    * Through simple sequence o forbitals in the unit cell
    * Through atom specification
    * Through atom and orbital specification
[x] Separation of TR and TRB components of the Hamiltonian, Identification of the exchange field.
[x] Definition of commutator expressions, old projection matrix elements
[x] Efficient calculation of Green's functions
[] Calculation of energy and momentum resolved derivatives
[] Parallel BZ and serial energy integral