Wherever appropriate, we use along this paper the common conventions and notations used in works dealing with the algebraic properties of Mueller matrices. Particularly convenient for some purposes is to express a Mueller matrix in the following partitioned form:6Display Formula
(1)where and are the respective diattenuation vector and polarizance vector of . The magnitudes of these vectors are the diattenuation and the polarizance . Note that while the symbol is also used for the differential Mueller matrix, we prefer maintaining this common notation for the submatrix of in Eq. (1). This ambiguity is better than introducing a new unusual notation and is always resolved by the context.