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I think it would be a good idea to remove the "=Q_i(r)" from the second sentence of the "Basic Step" section. It confused me because Q_i and Q_n refer to different points in time further below rather than to individual degrees of freedom (that's probably the intention of "=Q_i(r)" in the first place, right? To highlight that Q is still a vector).
Also, same section equations 2 seems incorrect to me. This is because substituting the first term on the right-hand side of equation 2 with the right-hand side of equation 3 yields twice the term "k_{LE} F(Q-Q_n)". I think the error lies in a wrong subscript here (i.e., change "Q_n" into "Q_{n+1}" in the right-hand side's second term of second equation of that section). — Preceding unsigned comment added by Nisse3333 (talk • contribs) 22:02, 10 February 2014 (UTC)