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SandBox Aldor Join and Meet

Edit detail for SandBox Aldor Join and Meet revision 3 of 9

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Editor: page Time: 2007/11/19 18:09:51 GMT-8
Note: Axiom library does not define 'Meet'

added:
The Axiom library apparently does not define 'Meet'.
\begin{aldor}
#include "axiom"
define C1:Category == with {
       f: Integer;
       g: Integer;
}
define C2:Category == with {
       f: Integer;
       h: Integer;
}
D: Meet(C1,C2) == add {
       f: Integer == 1;  -- OK; if this line is commented out, error:
                               -- The domain is missing some exports.
                               -- Missing f: AldorInteger
}
\end{aldor}

Aldor-Meet

On Date: Nov 19, 2007 10:58 AM Oleg Golubitsky wrote to aldor-l :

By analogy with Join, Meet(C1,C2) should return a category which has the intersection of exports of C1 and C2.

A simple test (see below) confirmed this semantics; I also could not find a description of Meet in the guide.

aldor#include "aldor"
define C1:Category == with {
       f: Integer;
       g: Integer;
}
define C2:Category == with {
       f: Integer;
       h: Integer;
}
D: Meet(C1,C2) == add {
       f: Integer == 1;  -- OK; if this line is commented out, error:
                               -- The domain is missing some exports.
                               -- Missing f: AldorInteger
}

aldor

   Compiling FriCAS source code from file 
      /var/zope2/var/LatexWiki/2046275806961882305-25px001.as using 
      AXIOM-XL compiler and options 
-O -Fasy -Fao -Flsp -laxiom -Mno-AXL_W_WillObsolete -DAxiom -Y $AXIOM/algebra
      Use the system command )set compiler args to change these 
      options.
#1 (Warning) Deprecated message prefix: use `ALDOR_' instead of `_AXL'
   Compiling Lisp source code from file 
      ./2046275806961882305-25px001.lsp
   Issuing )library command for 2046275806961882305-25px001
   Reading /var/zope2/var/LatexWiki/2046275806961882305-25px001.asy
   C1 is now explicitly exposed in frame initial 
   C1 will be automatically loaded when needed from 
      /var/zope2/var/LatexWiki/2046275806961882305-25px001
   C2 is now explicitly exposed in frame initial 
   C2 will be automatically loaded when needed from 
      /var/zope2/var/LatexWiki/2046275806961882305-25px001
   D is now explicitly exposed in frame initial 
   D will be automatically loaded when needed from 
      /var/zope2/var/LatexWiki/2046275806961882305-25px001

The Axiom library apparently does not define Meet.

aldor#include "axiom"
define C1:Category == with {
       f: Integer;
       g: Integer;
}
define C2:Category == with {
       f: Integer;
       h: Integer;
}
D: Meet(C1,C2) == add {
       f: Integer == 1;  -- OK; if this line is commented out, error:
                               -- The domain is missing some exports.
                               -- Missing f: AldorInteger
}

aldor

   Compiling FriCAS source code from file 
      /var/zope2/var/LatexWiki/666619708493282427-25px002.as using 
      AXIOM-XL compiler and options 
-O -Fasy -Fao -Flsp -laxiom -Mno-AXL_W_WillObsolete -DAxiom -Y $AXIOM/algebra
      Use the system command )set compiler args to change these 
      options.
#1 (Warning) Deprecated message prefix: use `ALDOR_' instead of `_AXL'
"/var/zope2/var/LatexWiki/666619708493282427-25px002.as", line 10: 
D: Meet(C1,C2) == add {
...^
[L10 C4] #2 (Error) There are no suitable meanings for the operator `Meet'.
   The )library system command was not called after compilation.