(%i3) ode2(D * 'diff('diff(C,x),x) - v * 'diff(C,x) - k,C,x); Is v zero or nonzero?nonzero; (%o3) C=%k1*%e^((v*x)/D)-(k*D+k*v*x)/v^2+%k2 Barton -----maxima-bounces at math.utexas.edu wrote: ----- >I?tried >D?*?'diff('diff(C,x),x)?-?v?*?'diff(C,x)?-?k >solve(%,?C,?x)