Enter the
command ``pasrecd():''. You will be asked to enter
the left member of the difference equation, the order of this
equation ( here), then a recurrent step ( here) associated to this equation. Likewise,
you will be asked to enter
the left member of the differential equation and the order of this
equation
( here).
Eventually, you will be asked to give
the expression of the unknown function
(here, ) then to enter an accuracy
that will be used in the computations. ** Watch out !**
You have to add
``;'' or ``:'' to all the answers that you give to the
program. In case of oversight, the
program will ask you again the same
question which you must answer by
``;'' or ``:''.
The program answers you a basis of entire functions candidate.
Then, you may run again the program asking for a better accuracy
(i.e. entering an accuracy constant smaller) in order to see
if the solution remains unchanged or, in the contrary, if there are
functions that appear or disappear.