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From: d0evert@dtek.chalmers.se (Mats Olsson)
Newsgroups: comp.sys.handhelds
Subject: Forming boolean expressions
Message-ID: <1990Sep22.163700.15239@mathrt0.math.chalmers.se>
Date: 22 Sep 90 16:37:00 GMT
Sender: news@mathrt0.math.chalmers.se (Evald Nyhetsson)
Distribution: comp
Organization: Dep of Mathematics, Chalmers, Gothenburg
Lines: 28

Hi there!

It seems to be impossible to use HP48/28`s built-in colecter
and expander to manipulate boolean expression, such like
(A OR B) AND NOT A.

Thats`s because I wonder if someone of YOU have written any
little program to make such manipulations. What I really mean
is a program which makes use of De Morgans Theorem to "solve"
and make such expressions easier.

Example: NOT (A OR B) <=> NOT (A) AND NOT (B)
              
         A AND NOT A = 0

                                     
         etc, etc

The expressions can, of cause, be much more complicated than theese exaples.
That`s because I Need the program!!

Please let me know how to use the HP for this, if anyone know something
about it (which I bet at least ONE of you out there do!)

Thanks a lot

Mats