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I want Sage to solve this equation: $y'''-3y''+y'-5y=0$.

Both

y=function('y')(x) 
desolve(diff(y,3)+3*diff(y,2)+diff(y,1)-5*y,y)

and

giac("desolve([y'''-3y''+y'-5y],y)").sage()

result in errors.

results in an error.

I want Sage to solve this equation: $y'''-3y''+y'-5y=0$.

Both

y=function('y')(x) 
desolve(diff(y,3)+3*diff(y,2)+diff(y,1)-5*y,y)

and

giac("desolve([y'''-3y''+y'-5y],y)").sage()

result in errors.

I want Sage to solve this equation: $y'''-3y''+y'-5y=0$.

Both

y=function('y')(x) 
desolve(diff(y,3)+3*diff(y,2)+diff(y,1)-5*y,y)
desolve(diff(y,3)-3*diff(y,2)+diff(y,1)-5*y,y)

and

giac("desolve([y'''-3y''+y'-5y],y)").sage()

result in errors.