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Article #1469

#1469

From: Ong Keh Yoe
Date: Wed, 17 Jan 1990 00:59

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A while ago someone posted a item saying that he needed TeX macros to
format tree proofs.  He wanted to be able to do things like


                  *a = b     a = b => ac = bc
                 -----------------------------
     9 = 2+2+5              9a = 9b                    *a = b
    -----------------------------------------         --------
                  2a + 2a + 5a = 2b + 2b + 5b          5a = 5b
                 ----------------------------------------------
                  2a + 2a + 5b = 2b + 2b + 5a
                 -----------------------------
                               .
                               .
                               .
                    ------------------------
                     2(a-b)+2(a-b) = 5(a-b)
                    ------------------------
                           2 + 2 = 5

Does anyone still have that article around? I've got some macros which I think
will do the job. (And if anyone else is interested, let me know.)

------------------------------------------------------------------------------
Erik Rantapaa                              presently: kehyoe@umn-cs.cs.umn.edu
Department of Mathematics
University of Minnesota

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Path: arc1-ca.pugleaf.net!utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!uwm.edu!uwvax!umn-d-ub!umn-cs!kehyoe
From: kehyoe@umn-cs.CS.UMN.EDU (Ong Keh Yoe)
Newsgroups: comp.text
Subject: Need help with posting...
Summary: tree proofs
Keywords: tree proofs, TeX macros
Message-ID: <18203@umn-cs.CS.UMN.EDU>
Date: 17 Jan 90 00:59:03 GMT
Reply-To: kehyoe@umn-cs.cs.umn.edu (Erik Rantapaa)
Followup-To: a posting a while ago
Organization: CSci Dept., University of Minnesota, Mpls.
Lines: 27