[Xy-pic] xy-pic Digest, Vol 44, Issue 1

[Michael Barr]

I don't know how to do it using the matrix version of xy-pic, but using 
the front end diagxy, it would be easy,  First, I would make a box, say 
\pbbox, with a couple rules to make the basic shape   
             _|
and then use the \place macro to put it where it is wanted.  I don't have 
access to tex right this minute, but when I get home I could whip 
something up in a couple minutes.

Michael

> ----------------------------------------------------------------------
> 
> Message: 1
> Date: Sun, 10 Jun 2007 14:10:48 -0400
> From: Kristoffer H Rose <krisrose at us.ibm.com>
> Subject: Re: [Xy-pic] Sur le symbole pull back.
> To: kamelouche kachourouche <pseudofoncteur at yahoo.fr>
> Cc: xy-pic at tug.org
> Message-ID:
> 	<OFB766775F.82407308-ON042572F6.005D82AB-042572F6.0063DDC9 at us.ibm.com>
> Content-Type: text/plain; charset=ISO-8859-1
> 
> Dear Kamelouche,
> 
> The place to ask specific Xy-pic questions in on the Xy-pic mailing list,
> so I am forwarding your mail here.
> 
> Dear everybody,
> 
> Kamelouche asks how to add a "pull-back" corner to an entry in an
> \xymatrix.  This must be standard...does anyone have a snippet of code that
> does this?
> 
> Cheers,
>       Kris
> 
> __
> Kristoffer H Rose, ph.d. <krisrose at us.ibm.com> +1(914)784-7642 (fax -6324)
> IBM T.J.Watson Research Center, PO Box 704, Yorktown Heights, NY 10598
> 
> 
> 
>                                                                            
>              kamelouche                                                    
>              kachourouche                                                  
>              <pseudofoncteur at y                                          To 
>              ahoo.fr>                  Kristoffer H Rose/Watson/IBM at IBMUS  
>                                                                         cc 
>              06/09/2007 01:35                                              
>              AM                                                    Subject 
>                                        Sur le symbole pull back.           
>                                                                            
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> 
> 
> 
>                              Cher monsieur Rose;>
> Qu'elle est la commande qui permet d'obtenir le symbole "pull back" dans un
> carr? cart?sien?
> Par exemple si $\xymatrix{a\ar[r]\ar[d]&b\ar[d]\\c\ar[r]&d}$ est un simple
> carr? commutatif , qui en plus est cart?sien (i.e est un pull back) , je
> souhaiterai mettre un symbole du genre $\lrcorner$ juste en dessous du
> "a"(sur l'angle droit du "a").
> J'?sp?re que j'ai ?t? pr?cis , et m?rci pour votre diligence , k.kachour.
> 
> 
> 
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> End of xy-pic Digest, Vol 44, Issue 1
> *************************************
>