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