In the frame of the Hartree-Fock approximation, the dispersion of
magnetoplasmons in Graphene is derived for all types of transitions for filling
factors ν≤6. The optical conductivity components of the magnetoplasmon
curves are calculated. It is shown that the electron-electron interactions lead
to a strong re-normalization of the apparent Fermi velocity of Graphene which
is different for different types of transitions.Comment: 15 pages, 7 figure