3f3f70a1-4173-4a71-a206-869168939209 4 15 12 decimal

&[DATE] &[TIME] - &[FILENAME]

restart MaximaControl Restart complete.

I want to have a symbolic solution of this third order linear ODE with Maxima "odes" package:

y''' 6 y'' * - 11 y' * + 6 y * - 3 x * ≡

But Maxima does not recognize the differentiation operator:

Even in SMath I cannot symbolically show the differentiation operator, it interprets as zero:

a b c d k f 61 sys x y 2^+ x atan sin x y x diff + y x 2 diff y x Diff'diff(y,x) str2num 61 sys MaximaDefine a b c d k f 61 sys x y 2^+ x 1 x 2^+ sqrt / x 0 y x Diff y x diff 61 sys MaximaDefine

x y x 2^sin * + x y x 2^sin * +

x y x diff + 3 y * x 2^* - x 0 + 3 y * x 2^* -

y x diff 0

y x 2 diff 0

# MaximaLog #

x Gamma x diff #

x Psi x Gamma *

1 i + Psi 0.094650320622477 1.07667404746858 i * +

1.25 Psi 0.227453533376266 -

u 1.25 :

u Psi u Gamma * 0.206 -

x erf x diff #

x D 2 x sqrt / x 2^- exp * :

n ... 0,1,2 .. n 1 :

x D x n diff x 2^- exp 14 x * x sqrt 2^* + (* x sqrt x sqrt 2^* / -

x Gamma x 0.125 e int #

x Gamma vectorize x 0.125 e int x erf vectorize x 0 e int 21 mat 3.707 2.154 21 mat

x erf x 0 e int #