Upper Bounds on the Number of Determining Modes, Nodes, and Volume Elements for the Navier-Stokes Equations Don JonesEdriss Titi Indiana University Mathematics Journal 1993 text pdf 10.1512/iumj.1993.42.42039 10.1512/iumj.1993.42.42039 en Indiana Univ. Math. J. 42 (1993) 875 - 887 state-of-the-art mathematics http://iumj.org/access/