Is this a U?

jjg7 March 2007 · 05:39

Hi all

The attached are taken from Frege's Grundgesetze der Arithmetik
(Jenna, Germany 1893). Athough the symbol on the middle of the
second line looks like a U, the vertical strokes seem to me to
be too close together; I thought it might be a commercial sign
like the "per" symbol (unicode U-214C).

I'd be most grateful if anyone could tell me more about it.

Thanks in advance

Jim

Attachment	Size
para-U.jpeg	93.41 KB
char-U.png	55.6 KB

Conor7 March 2007 · 07:29

May be the old symbol for “Union” in set theory?

jjg7 March 2007 · 08:17

Conor, I don't think it is a union symbol since
that was only introduced in 1888 (by Peano) and
was without ductus, rather like the modern form.

-j
--
http://pdfb.wiredworkplace.net/pub/jjg/

glyphobet7 March 2007 · 08:55

I thought it might be "Not-greater-than", U+226F, ≯, but that' can't follow '=', as it does in the second line.

-m

Conor7 March 2007 · 09:23

Perhaps an early (or Frege’s) way of symbolising “universal quantification” or “∀”.

Captured from commoncrawl.org on 21 Apr 2015. original URL