Revision as of 12:21, 12 December 2012 by Goodwine(talk | contribs)(Created page with "The equation should be <math>W(x_1,x_2)(t) = x_1(t) \dot x_2(t) - x_2(t) \dot x_1(t)</math> [[Engineering Differential Equations: Theory and Applications, Springer 2010#Errata|...")
