This is old news. The interpretation of U+2118 was fixed in Unicode
3.0 many months ago. The data is available in the UNIDATA directory--
see NamesList.txt. But here is the relevant excerpt:
2118 SCRIPT CAPITAL P
= Weierstrass elliptic function
* actually this has the form of a lowercase calligraphic p, despite its name
And the glyph shown in the Unicode 3.0 charts has the distinctive
calligraphic p form associated with the Weierstrass elliptic function.
This is the reason why MATH SCRIPT CAPITAL P was *not* omitted in
the math alphanumerics proposal -- because U+2118 "SCRIPT CAPITAL P" is
not actually SCRIPT, nor is it CAPITAL.
> Dear Unicode gurus,
> As noted on
> in question 18, Unicode 2.1 confuses and combines as U+2118 the
> potentially very different characters
> a) SCRIPT CAPITAL P
> b) POWER SET
> c) WEIERSTRASS ELLIPTIC FUNCTION
> My limited exposure to mathematics suggests that while a) and b) might
> well be unified (?), c) is certainly something very different with a
> descender, and the Unicode 2.0 and UCS:1993 example glyph only matches
> meaning c) in contrast to the name of this character.
> It seems that the AMS STIX project <http://www.ams.org/STIX/> is already
> very busyly working on deconfusing these in the revision of the math
> aspects of Unicode.
> Was the meaning of U+2118 already somehow clarified in Unicode 3.0?
> Shall a Unicode 3.0 font designer prefer to let U+2118 look like a
> SCRIPT CAPITAL P (for power sets) or like a WEIERSTRASS ELLIPTIC
> FUNCTION symbol?
> >From the ISO proposal on
> I concluded so far that MATH SCRIPT CAPITAL P in plane 1 will not be
> excluded by the already available U+2118 SCRIPT CAPITAL P, so am I right
> in assuming that U+2118 will continue to be associated with the
> Weiserstrass-style glyph found in Unicode 2.0 and UCS:1993?
> Markus G. Kuhn, Computer Laboratory, University of Cambridge, UK
> Email: mkuhn at acm.org, WWW: <http://www.cl.cam.ac.uk/~mgk25/>
This archive was generated by hypermail 2.1.2 : Tue Jul 10 2001 - 17:20:56 EDT