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RE: menclose

From: Paul Topping <pault@dessci.com>
Date: Wed, 6 Aug 2003 16:34:11 -0700
Message-ID: <46566A3075DDD311969100E0811031EC024A368D@euclid.dessci>
To: Robert Miner <RobertM@dessci.com>, jpederse@wiley.com
Cc: www-math@w3.org

MathType also has a sort of "not" strikeout that is like NE/SW but the angle
is more nearly vertical and doesn't vary from use to use like the corner to
corner ones do. It is a sort of generalized negation. This is only available
as an embellishment however, not as a template.

We should also define how these compose. It should be possible to cross-out
a circled expression. Would this be done as:

   <menclose notation="circle">
      <menclose notation="nesw_strikeout">
         ...
      </menclose>
   </menclose>

or

   <menclose notation="circle nesw_strikeout">
      ...
   </menclose>

If we do the former, we would somehow have to handle this properly in the
implementation to prevent double application of the extension of the
cross-out lines outside of the bounding box of its contents. Of course, if
we think that sometimes that is desirable, then we have an ambiguity to
resolve. I vote for the latter -- it is easier to implement and more
flexible. Only certain notation values would be allowed to be composed. A
struck-out long division would require nested mencloses.

Paul

----------------------------------------------------------------
Paul Topping                     email: pault@dessci.com            
                                 phone: 562-433-0685            
Design Science, Inc.             http://www.dessci.com
"How Science Communicates"
MathType, WebEQ, MathPlayer, Equation Editor, TeXaide
----------------------------------------------------------------
 

> -----Original Message-----
> From: Robert Miner [mailto:RobertM@dessci.com] 
> Sent: Wednesday, August 06, 2003 3:15 PM
> To: jpederse@wiley.com
> Cc: www-math@w3.org
> Subject: menclose
> 
> 
> 
> 
> Hi John,
> 
> I'm trying to nail down a list of candidates for new menclose 
> values. Does this sound right?
> 
> NE/SW strikeout
> NW/SE strikeout
> horizontal strikeout
> box
> circle
> 
> Actuarial notation is one of the current values, but it is only 
> one of the four possible "corners" of a box.  MathType does 
> all four, so I would be for adding
> 
> NE corner
> SE corner
> SW corner
> NW corner
> 
> as well.  Obviously "NE corner" duplicates "actuarial" but if 
> I let little things like that start bothering me, it is 
> definitely time to get out of the MathML biz :-).
> 
> Anyway, if this is the list, we can start trying to come up 
> with some names. 
> 
> --Robert
> 
> ------------------------------------------------------------------
> Dr. Robert Miner                                RobertM@dessci.com
> MathML 2.0 Specification Co-editor                    651-223-2883
> Design Science, Inc.   "How Science Communicates"   www.dessci.com
> ------------------------------------------------------------------
> 
> 
Received on Wednesday, 6 August 2003 19:40:07 GMT

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