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From: Ben Bacarisse <ben.usenet@bsb.me.uk>
Newsgroups: comp.programming,alt.algebra.help
Subject: Re: on cut edges and bonds, graph theory
Date: Fri, 22 Sep 2017 21:18:36 +0100
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David Brown <david.brown@hesbynett.no> writes:
<snip>
> Out of curiosity, how do you type the S̅?  Is it a combining macron or
> something?

A macron is usually shorter: S̄.  It's a combining overline (U+0305).

I use Emacs as my Usenet client so I use that directly because it can
auto-complete (and search) Unicode character names.  When I write the
original, I was not sure what character was the right one (and I did
indeed try a macron first!) so seeing all the completion options was
very helpful.

-- 
Ben.