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Re: Re: More /.{I->-1} craziness
*To*: mathgroup at smc.vnet.net
*Subject*: [mg106096] Re: [mg106050] Re: More /.{I->-1} craziness
*From*: Murray Eisenberg <murray at math.umass.edu>
*Date*: Fri, 1 Jan 2010 05:36:00 -0500 (EST)
*Organization*: Mathematics & Statistics, Univ. of Mass./Amherst
*References*: <hhf5s3$h4o$1@smc.vnet.net> <200912310816.DAA24818@smc.vnet.net>
*Reply-to*: murray at math.umass.edu
"One of the first things you learn...." Hmm... Where exactly in the
Documentation Center would one be expected to learn about replacement
rules -- and is that really one of the first things you learn there?
When I ask this, I try to place myself in the position of somebody who
has NOT come to Mathematica with a long experience of previous versions
and their associated documentation.
David Bailey wrote:
>
> .... One of the first
> things you learn about replacement rules is that they operate
> structurally, and the structure of -I (FullForm[-I]) is Complex[0,-1],
> which clearly does not match FullForm[I], which is Complex[0,1] - end of
> story!
--
Murray Eisenberg murray at math.umass.edu
Mathematics & Statistics Dept.
Lederle Graduate Research Tower phone 413 549-1020 (H)
University of Massachusetts 413 545-2859 (W)
710 North Pleasant Street fax 413 545-1801
Amherst, MA 01003-9305
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