[Maxima] Void in Maxima
rich.hennessy at verizon.net
Mon Oct 5 09:37:38 CDT 2009
Maybe the idea is too hard to implement as this point. If there was an way
to do it I without so much effort it would have been a good idea.
----- Original Message -----
From: "Richard Fateman" <fateman at cs.berkeley.edu>
To: "Barton Willis" <willisb at unk.edu>
Cc: "Richard Hennessy" <rich.hennessy at verizon.net>; "Maxima List"
<maxima at math.utexas.edu>
Sent: Monday, October 05, 2009 10:04 AM
Subject: Re: [Maxima] Void in Maxima
> what may not be clear to everyone in this discussion is that adding a new
> object with special properties like the ones suggested for "void" requires
> an examination of many places in Maxima.
> For example, the instructions for simplifying "void + x" would not be
> encoded in the object "void". These are encoded on the property list of
> the object "+".
> Thus to make "void", or for that matter, inf, und, ind, intervals, etc
> work, one has to modify +, *, sin, cos, exp, log, integrate, diff, etc etc
> Now maybe this organization is wrong, but that's the way it is. (arguing
> about whether cos(void) should send a "void" message to "cos" or a "cos"
> method to "void" does not
> offer a solution to "void+infinity+interval(-1,1)")
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