Talk:Curvature invariant (general relativity)/to do

Task for expert:
 * add material explaining how the following are related to the principle invariants:
 * characteristic polynomial of Riemann tensor (as operator on bivectors),
 * Hodge duals of curvature two-forms,
 * Fermi normal coordinate chart,
 * electric-electric, electric-magnetic, magnetic-magnetic parts of Riemann tensor in GEM formalism (correspond essentially to electrogravitic, magnetogravitic, topogravitic parts).

Task for anyone:
 * spell check
 * improve diction
 * note anything unclear on talk page