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Re: Subscripts in Content MathML

From: Stan Devitt <jsdevitt@stratumtek.com>
Date: Thu, 6 Oct 2005 16:13:42 -0400
To: Mathematics <maths@mathsonly.com>
Cc: www-math@w3.org
Message-ID: <20051006201342.GA28824@stratumtek.ca>

For the record:

1.  The decision to allow presentation inside of <ci>...</ci> was deliberate.  The
view was that a "symbol" could have a very complicated appearance and still be
treated as a single symbol for the purposes of content mathml.

2.  For elipses in sums and sequences I have taken a more formal approach than has 
been suggested so far.  I defined a function - roughly

	special_seq( base, operand , before_index_low, before_index_high, 
		elipse_token , after_index_low, after_index_high )

so that
	special_seq( a , "+" , 1 , 3 , "..." , n-1 , n )

can be  mapped to the presentation

		a_1 +  a_2 + a_3 + ... + a_{n-1} + a_n

and to the computational form

		Sum( a_i , i=1..n );

There is no ambiguity (at least no more than usual) for either the computation
or presentation.  Of course a transform is required.

Stan Devitt

in response to:

> <ci><msub><ci>a</ci><ci>i</ci></msub></ci>    (*)
> 
 and
> 
> 
> >aside of the encoding problem of a_i you have such problems
> >as encoding the ellipsis a_1, ..., a_k,

...
> Look forward to your opinions,
> Charles Lyons.
Received on Thursday, 6 October 2005 20:15:59 GMT

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