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Re: Re: More /.{I->-1} craziness

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  • Subject: [mg106095] Re: [mg106048] Re: More /.{I->-1} craziness
  • From: Murray Eisenberg <murray at>
  • Date: Fri, 1 Jan 2010 05:35:49 -0500 (EST)
  • Organization: Mathematics & Statistics, Univ. of Mass./Amherst
  • References: <hhf5s3$h4o$> <>
  • Reply-to: murray at

OK, so what, in an earlier post today, I suggested needed to be said in 
the docs is said there, although not in quite so direct a form ("What 
you see is not what is acted upon", as stated by Alexander Elkins).

The issue, it seems, is how and when one finds such principles in the 
docs.  Presumably the Virtual Book that's part of the Documentation 
Center would readily lead one to that tutorial. And it's there, to be 
sure -- but not so easy to find:

Core Language > Patterns > Patterns for some Common Types of Expressions

Part of the difficulty in finding such things in the Documentation 
Center may be the granularity of the documentation (as contrasted with 
the now-defunct, printed "The Mathematica Book" -- if I may be permitted 
to beat a dead horse).

Norbert P. wrote:
> ... as you can read in tutorial/
> PatternsForSomeCommonTypesOfExpression:
>    "Especially for some common kinds of expressions, the standard
> output format used by   Mathematica is not particularly close to the
> full internal form. But it is the internal form that you must use in
> setting up patterns. "

Murray Eisenberg                     murray at
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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