>
>
>
>
> Please tell me how to define "D"prefix operator.D means prefix operator
> and "d/dx" differential operator.I want to solve "(D+x) (D+2*x) exp(x)".
> _______________________________________________
> Maxima mailing list
> Maxima at math.utexas.edu
> http://www.math.utexas.edu/mailman/listinfo/maxima
>
While it is probably possible to do all that is necessary in Maxima
it is likely not worth your doing it, or finding/reading one of the
several papers on introducing operators in Macsyma.
http://dl.acm.org/citation.cfm?id=32488
and others, by Golden and Grossman
As I recall you need to worry about a bunch of things you may have not
noticed. Like the number 3 is also an operator which when applied to Z
returns 3, or maybe 3*Z?
My suggestion is you deal with D (etc) operators as elements in a
(non-commuting) ring and do polynomial arihmetic,
and then write a program that applies this to an
expression according to how you want to interpret stuff.
Or just decide not to use operator expressions; they save some
handwriting, but I suspect that in particular cases they don't buy you
much when a computer is doing the algebra.