dear Hedos,
I would recommend to look at the homepage of the free CAS YaCAS from Ayal Pinkus, google
for 'YaCAS'. A. Pinkus has written an article in a Springer lecture note about that
theme.
You will find notes on building YaCAS as a 'do it yourself CAS' using a special version of
Lisp.
Hope that helps.
Wolfgang
>> -----Original Message-----
>> From: maxima-bounces at math.utexas.edu
>> [mailto:maxima-bounces at math.utexas.edu] On Behalf Of Harald Geyer
>> Sent: Thursday, May 10, 2007 7:40 AM
>> To: Hedos; maxima at math.utexas.edu
>> Subject: Re: [Maxima] Computer algebra system?
>>
>> Hi Hedos!
>>
>> I'm interested about how one can build a simple symbolic
>> mathematic systems
>> on a computer.