Talk:Mathematical Alphanumeric Symbols

Letters showing up

has no one noticed the fact that none of the letters shown up??? --AeomMai 23:29, 10 April 2006 (UTC)[reply]

You need to have the correct fonts installed. —porg es_(talk) 03:23, 25 June 2006 (UTC)[reply]

Commercial at

dose anyone know what is the name in maths of (@) IS —Preceding unsigned comment added by Joeyjomanco (talk • contribs) 18:01, 13 February 2009 (UTC)[reply]

The "at sign" is typographically known as commat, as in "commercial at". A few years ago, it was assigned a morse code symbol, the first change in morse in a veryh long time. —Preceding unsigned comment added by 112.203.198.236 (talk) 08:23, 11 January 2010 (UTC)[reply]

Incorrect values for ℛ (U+211B SCRIPT CAPITAL R), etc

This article, as it currently exists, is not correct. It shows a script capital R in this unicode block (U+1D400 ... U+1D7FF), but there is no script capital R here. Instead, unicode has a script capital R elsewhere (at U+211B). The same is true for a variety of other characters (looking at Unicode code chart U1D400 (PDF), which is currently an external link but should be a reference, it looks like Swiss cheese). If we want to stick with presenting these characters by Unicode block, we should just take out all those characters. If we want to keep together related characters, we need to get rid of the numbers (or come up with some presentation which can show the numbers, which might be in a different block, somehow). Kingdon (talk) 18:21, 18 September 2010 (UTC)[reply]

Code point U+1D4AD 𝒭 <reserved-1D4AD> (is not assigned). The linked Unicode page (U1D400.pdf) says on page 7: <reserved>, meaning: not assigned (not a character). Then it refers specifically to {U+211B ℛ SCRIPT CAPITAL R (&realine;, &Rscr;). So the facts Kingdon writes are correct.

But I don't understand the bigness of the problem. Anyone can change the chart here. See this edit. Go ahead if you like. And if it becomes Swiss cheese -- if its Unicode, it'll be OK. -DePiep (talk) 20:44, 18 September 2010 (UTC)[reply]

Well, I trust you agree that having wrong information is a problem (I won't quibble about what size problem). I have fixed it as you suggest, by blanking the characters which aren't in this block (and I also removed the numbers at the top of the plain greek letter columns, as the plain characters are not in order). This means that we don't have any pointer to where characters such as ℛ actually are, but since I'm not thinking of a really obvious way to put such a pointer in, I'm not going to worry about that for now. Kingdon (talk) 15:16, 1 October 2010 (UTC)[reply]

It would probably be nice to show what the numbers are, since these missing characters are a lot harder to find than the originals! Also it was my mistake initially to not realize that there were "holes" in the encoding, I was the one who put the numbers in the columns originally. Also some explanation as to why Unicode thought it was a bad idea to just make the "hole" print the glyph? They seem to allow duplicate glyphs lots of other places, so why not here? unsigned

Unicode tries to avoid duplicates at great cost. In regular text, there is no difference for Unicode between roman or scripted, that's a font-style, and a higher level protocol than Unicode. The ones that are not here, were put in elsewhere earlier for more basic (common) mathematical use. Only versions later they had to admit that in maths there is a different meaning between script-A and italic-A, so these letters are different by style and had to be added. I think letterpickers search by "General category=Symbol, math", or have made tjheir own combination list.

I've added a note about the block Letterlike symbols. Over all the charts we have in Category:Unicode chart templates, I have seen little use of such pointers yet. Unicode has them in the descriptive list, not the chart. Maybe flesh out in the overview page Mathematical operators and symbols in Unicode? -DePiep (talk) 02:36, 7 October 2010 (UTC)[reply]