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Re: What is "f'(x)" as MathML?

From: Will Robertson <wspr81@gmail.com>
Date: Sat, 22 Jan 2011 11:43:25 +1030
Message-Id: <D2084252-570F-47AE-B104-F7D5477C98F4@gmail.com>
Cc: "J.Fine" <j.fine@open.ac.uk>, Robert Miner <robertm@dessci.com>, Daniel Marquès Solé <dani@wiris.com>, "www-math@w3.org" <www-math@w3.org>
To: David Carlisle <davidc@nag.co.uk>
(Sent quickly. Please excuse brevity.)

On 22/01/2011, at 3:43 AM, David Carlisle <davidc@nag.co.uk> wrote:

> On 21/01/2011 16:47, J.Fine wrote:
>> (Unicode 3.2 lacks a dot-less j and a non-superscript prime)".
> 
> ah but we got a dotless j into unicode (4.1) two of them in fact:
> 
> 0237;LATIN SMALL LETTER DOTLESS J;Ll;0;L;;;;;N;;;;;
> 1D6A5;MATHEMATICAL ITALIC SMALL DOTLESS J;Ll;0;L;<font> 0237;;;;N;;;;;
> 
> It's not clear if a new prime symbol would really help much because (as with having a separate minus sign separate from - users will use the ascii one anyway so rendering systems need to cope with the existing prime as well as any new one.
> 
(snip)
> 
> It is probably hard to find any uses of a non superscripted prime.

Indeed. In OpenType maths, (in any well behaved maths font) the prime symbol reverts to its non-subscripted form when the +ssty feature is enabled to indicate the symbols are for use in a subscript/superscript context. I don't know what the status is of browsers using OpenType font features, but following this practice would seem sensible to me. 

Will

> 
Received on Saturday, 22 January 2011 01:14:07 GMT

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