moved src/flatten.lisp to share/algebra/charsets/ and related changes

Yes, Robert has the newest Nset.   As for a file name, if there is
compelling reason to change it, that's OK.  But i kinda like Nset.

We should have a project to support various discontinuous 
functions--unit step and the like.  They should be simplifying
functions (as is kron_delta).   Writing a simplifying unit_step
function isn't all that difficult. But you'll discover bugs and
other weirdnesses in sign and getting integrate to do anything
with unit_step seems difficult to me.

Barton




Robert Dodier 
Sent by: maxima-admin@math.utexas.edu
02/23/2005 01:34 PM

 
        To:     C Y 
        cc:     maxima@math.utexas.edu, willisb@unk.edu
        Subject:        Re: [Maxima] moved src/flatten.lisp to share/algebra/charsets/ and related 
changes


Hi Cliff, you wrote:

> Question - do we preserve the nset filename 
> or make this the new set.lisp? 

I guess I'm inclined to keep the same file name.

> Barton, is the version we have in cvs current? 

I copied nset 1.2.03 from Barton's web site and committed it
a couple of weeks ago. It looks like that's still up to date.

> P.S. - I notice the docs for nset mention a Kronecker delta function
> is defined there.  There are lots of physics related problems that
> just loooove to throw in Kronecker deltas - does it make sense/is it
> workable to make Maxima more aware of how to work with delta
> functions for things like integration? 

I'd like to for Maxima to know more about delta functions,
step functions, stuff like that. I've run across these pretty
often in applications (statistics in this case). I suppose
it wouldn't be easy to impart that knowledge, though.

Hope this helps,
Robert Dodier

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