Colour Theory, Linear Algebra, Vector Space, Colorimetry, Linear Transformation.
value by the sum of the intensities of all the primaries. For example, a standard white stimulus (S) can be expressed as Ls(S) = Us R + Vs G + Ws B. Assuming L = Ls / (Us + Vs + Ws), x = Us / (Us + Vs + Ws), y=Vs / (Us+Vs+ Ws), z=Ws / (Us+Vs+ Ws), then any coloured stimulus C can be expressed as C