Re: Slashed circle symbol for the empty set

Jon Awbrey <[email protected]>
Newsgroups gmane.comp.inquiry
Message-ID <[email protected]> 
Re: http://www.cs.nyu.edu/pipermail/fom/2009-April/013519.html

I don't know about the slashed variant, but I know that C.S. Peirce
was using a simple 0 for "the class without extent" before 1870,
and Boole used 0 to represent Nothing as a class of no extent.

Jon Awbrey

-- 

inquiry list: http://stderr.org/pipermail/inquiry/
mwb: http://www.mywikibiz.com/Directory:Jon_Awbrey
knol: http://knol.google.com/k/-/-/3fkwvf69kridz/1
lmpx.com only provides a reader for public news (NNTP) servers. It is not affiliated with the servers or forums shown here and is not responsible for the content of articles, which is written by their respective authors.