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>

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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