  We consider angular diagrams describing the dependence of the magnetic
conductivity of metals on the direction of the magnetic field in rather strong
fields. As it can be shown, all angular conductivity diagrams can be divided
into a finite number of classes with different complexity. The greatest
interest among such diagrams is represented by diagrams with the maximal
complexity, which can occur for metals with rather complicated Fermi surfaces.
In describing the structure of complex diagrams, in addition to the description
of the conductivity itself, the description of the Hall conductivity for
different directions of the magnetic field plays very important role. For the
evaluation of the complexity of angular diagrams of the conductivity of metals,
it is convenient also to compare such diagrams with the full mathematical
diagrams that are defined (formally) for the entire dispersion relation.
