11. The electromagnetic field can then be deduced from the general formulae : 12. The projection formulae differ slightly from the Redfearn formulae presented here. 13. The projection formulae differ slightly from the Redfearn formulae presented here. 14. Cavity perturbation theory generally relies on formulae involving stored energy considerations. 15. Approximate formulae for the parameters and their variances were also derived. 16. See the formulae in the List of Moments of Inertia article. 17. :: : The difference between the formulae is just cosmetic. 18. Traditionally, algebraic formulae determine time derivatives of the coarse model. 19. I suggest doing this for the images which represent mathematical formulae . 20. The following formulae are strictly correct only for a flat surface.