Talk:Democratic principle/to do

Tasks for expert:

write and link to an article comparing various possible measures of distance in cosmology, to explain the reference to the multiplicity of possible definition of distance even in a given Cauchy hyperslice,
write and improve proper article on ADM formalism and Cauchy hyperslice, for more neccessary background,
write and improve article on gravitomagnetism and various different GEM formalisms, making sure to carefully explain how they are related to one another and what assumptions they employ (don't forget Bel decomposition!),
expand discussion to include explicit computations according to flat space democratic principle, including examples which work as expected and examples which do not,
in particular, exbibit nonzero vorticity, diverging integrals, and other problems mentioned in current version.