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why can't mma find this limit ??
I have the simple function n[t_]=3DK n0/((K-n0) Exp[-r t] + n0) (the solution of logistic growth dN/dt=3Dr (1-N/K) N ) In the limit t=3D0 this function is n0 and mma can calculate this. The li= mit for Inifinity is obviously K, but mathematica returns the limit unevaluated In: Limit[n[t],t->Infinity] Out: Limit[(K*n0)/((K - n0)/E^(r*t) + n0),=20 =20 t -> DirectedInfinity] Any idea why? Is there a package that helps for such problems? Thanks, Christian. --=20 Christian Jost, Universit=E9 Paris-Sud XI, Orsay, France jost at psisun.u-psud.fr