Kramers-Kronig relations and causality conditions for graphene in the framework of the Dirac model properties for its real and imaginary parts. This results in the
Kramers-Kronig relations, which explicit
Crystal field parameters and g-factors of the ground kramers doublet of Ce3+ ion in LIYF4 crystal Kramers doublet of the impurity Ce3+ ions in LiYF4 crystal that rigorously take into account mixing