Re: on cut edges and bonds, graph theory

From	David Brown <david.brown@hesbynett.no>
Newsgroups	comp.programming, alt.algebra.help
Subject	Re: on cut edges and bonds, graph theory
Date	2017-09-26 13:24 +0200
Organization	A noiseless patient Spider
Message-ID	<oqddd2$rkd$1@dont-email.me> (permalink)
References	(5 earlier) <87shfebi77.fsf@bsb.me.uk> <oqae30$ofl$1@dont-email.me> <87k20m1sn4.fsf@bsb.me.uk> <oqd255$ci6$1@dont-email.me> <87r2utive4.fsf@bsb.me.uk>

Cross-posted to 2 groups.

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On 26/09/17 12:53, Ben Bacarisse wrote:
> David Brown <david.brown@hesbynett.no> writes:
> 
>> On 25/09/17 21:32, Ben Bacarisse wrote:
>>> David Brown <david.brown@hesbynett.no> writes:
>>>
>>>> On 22/09/17 22:18, Ben Bacarisse wrote:
>>>>> 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.
>>>>
>>>> Like this: ̅S ?
>>
>>> Yes, except that combining marks go after the glyph they combine with.
>>
>> Interesting - I did not realise there was a difference.  Putting the
>> combining mark first gives ̅S while putting it last gives S̅.  There is a
>> noticeable difference in these two glyphs (at least with the fonts I am
>> using) - putting the combing mark last sets its height to fit the S
>> better.
> 
> Oh!  Not what I see.  Here, the first puts the overline on the space,
> the second on the S.  I don't think the combining characters work very
> well in most fonts and display systems.  I used this one only because I
> was referring to a book that used that specific notation and there was a
> chance the OP would see what I intended.
> 

More interesting information.

On my system (an out-of-date Redhat Linux, with an old version of
Thunderbird) I see the first as an overline on top of an S.  When I type
the u0305, I get an overline to the right of the cursor.  I can then
type another character, such as S, which appears at the same spot.  But
clearly the position of the line and its width is not adjusted to give
an S with an overline - it looks more like a stand-alone overline
character with a zero logical width.  Perhaps your newsreader (or
unicode font) does not support zero logical widths like that?

Anyway, now I know that I must put my combining marks after the letter.
 I wouldn't want my posts to look bad for people with old-fashioned
newsreaders :-)

Thread

on cut edges and bonds, graph theory Daniel Bastos <dbastos@toledo.com> - 2017-09-18 12:51 -0300
  Re: on cut edges and bonds, graph theory Ben Bacarisse <ben.usenet@bsb.me.uk> - 2017-09-18 20:40 +0100
    Re: on cut edges and bonds, graph theory William Elliot <marsh@panix.com> - 2017-09-18 21:39 -0700
      Re: on cut edges and bonds, graph theory Ben Bacarisse <ben.usenet@bsb.me.uk> - 2017-09-19 13:05 +0100
        Re: on cut edges and bonds, graph theory William Elliot <marsh@panix.com> - 2017-09-19 19:47 -0700
          Re: on cut edges and bonds, graph theory Ben Bacarisse <ben.usenet@bsb.me.uk> - 2017-09-20 14:28 +0100
            Re: on cut edges and bonds, graph theory William Elliot <marsh@panix.com> - 2017-09-20 21:06 -0700
              Re: on cut edges and bonds, graph theory Ben Bacarisse <ben.usenet@bsb.me.uk> - 2017-09-21 17:03 +0100
                Re: on cut edges and bonds, graph theory Daniel Bastos <dbastos@toledo.com> - 2017-09-21 15:06 -0300
                Re: on cut edges and bonds, graph theory Ben Bacarisse <ben.usenet@bsb.me.uk> - 2017-09-21 21:24 +0100
                Re: on cut edges and bonds, graph theory Daniel Bastos <dbastos@toledo.com> - 2017-09-21 17:57 -0300
                Re: on cut edges and bonds, graph theory Ben Bacarisse <ben.usenet@bsb.me.uk> - 2017-09-21 23:40 +0100
                Re: on cut edges and bonds, graph theory William Elliot <marsh@panix.com> - 2017-09-21 20:45 -0700
                Re: on cut edges and bonds, graph theory Ben Bacarisse <ben.usenet@bsb.me.uk> - 2017-09-23 02:27 +0100
                Re: on cut edges and bonds, graph theory William Elliot <marsh@panix.com> - 2017-09-22 19:49 -0700
                Re: on cut edges and bonds, graph theory Richard Heathfield <rjh@cpax.org.uk> - 2017-09-23 08:04 +0100
                Re: on cut edges and bonds, graph theory Daniel Bastos <dbastos@toledo.com> - 2017-09-23 08:41 -0300
                Re: on cut edges and bonds, graph theory Paul N <gw7rib@aol.com> - 2017-09-24 14:00 -0700
                Re: on cut edges and bonds, graph theory Ben Bacarisse <ben.usenet@bsb.me.uk> - 2017-09-23 14:50 +0100
                Re: on cut edges and bonds, graph theory William Elliot <marsh@panix.com> - 2017-09-23 22:04 -0700
                Re: on cut edges and bonds, graph theory Richard Heathfield <rjh@cpax.org.uk> - 2017-09-24 07:39 +0100
                Re: on cut edges and bonds, graph theory William Elliot <marsh@panix.com> - 2017-09-25 01:13 -0700
                Re: on cut edges and bonds, graph theory Richard Heathfield <rjh@cpax.org.uk> - 2017-09-25 09:46 +0100
                Re: on cut edges and bonds, graph theory William Elliot <marsh@panix.com> - 2017-09-25 21:38 -0700
                Re: on cut edges and bonds, graph theory Richard Heathfield <rjh@cpax.org.uk> - 2017-09-26 10:19 +0100
                Modern Trash William Elliot <marsh@panix.com> - 2017-09-26 03:37 -0700
                Re: Modern Trash David Brown <david.brown@hesbynett.no> - 2017-09-26 12:52 +0200
                Re: Modern Trash Richard Heathfield <rjh@cpax.org.uk> - 2017-09-26 23:10 +0100
                Re: on cut edges and bonds, graph theory Ben Bacarisse <ben.usenet@bsb.me.uk> - 2017-09-24 22:33 +0100
                Re: on cut edges and bonds, graph theory William Elliot <marsh@panix.com> - 2017-09-25 01:08 -0700
                Re: on cut edges and bonds, graph theory Ben Bacarisse <ben.usenet@bsb.me.uk> - 2017-09-25 20:44 +0100
                Re: on cut edges and bonds, graph theory William Elliot <marsh@panix.com> - 2017-09-25 21:36 -0700
                Re: on cut edges and bonds, graph theory Ben Bacarisse <ben.usenet@bsb.me.uk> - 2017-09-26 12:04 +0100
                Re: on cut edges and bonds, graph theory William Elliot <marsh@panix.com> - 2017-09-26 23:15 -0700
                Re: on cut edges and bonds, graph theory Ben Bacarisse <ben.usenet@bsb.me.uk> - 2017-09-27 12:52 +0100
                Re: on cut edges and bonds, graph theory William Elliot <marsh@panix.com> - 2017-09-27 19:55 -0700
                Re: on cut edges and bonds, graph theory Ike Naar <ike@iceland.freeshell.org> - 2017-09-24 16:55 +0000
        Re: on cut edges and bonds, graph theory David Brown <david.brown@hesbynett.no> - 2017-09-22 10:23 +0200
          Re: on cut edges and bonds, graph theory Ben Bacarisse <ben.usenet@bsb.me.uk> - 2017-09-22 21:18 +0100
            Re: on cut edges and bonds, graph theory Daniel Bastos <dbastos@toledo.com> - 2017-09-23 08:48 -0300
            Re: on cut edges and bonds, graph theory David Brown <david.brown@hesbynett.no> - 2017-09-25 10:17 +0200
              Re: on cut edges and bonds, graph theory Daniel Bastos <dbastos@toledo.com> - 2017-09-25 07:31 -0300
                Re: on cut edges and bonds, graph theory David Brown <david.brown@hesbynett.no> - 2017-09-25 13:30 +0200
              Re: on cut edges and bonds, graph theory Ben Bacarisse <ben.usenet@bsb.me.uk> - 2017-09-25 20:32 +0100
                Re: on cut edges and bonds, graph theory David Brown <david.brown@hesbynett.no> - 2017-09-26 10:12 +0200
                Re: on cut edges and bonds, graph theory Ben Bacarisse <ben.usenet@bsb.me.uk> - 2017-09-26 11:53 +0100
                Re: on cut edges and bonds, graph theory David Brown <david.brown@hesbynett.no> - 2017-09-26 13:24 +0200
    Re: on cut edges and bonds, graph theory Daniel Bastos <dbastos@toledo.com> - 2017-09-19 16:21 -0300
      Re: on cut edges and bonds, graph theory Ben Bacarisse <ben.usenet@bsb.me.uk> - 2017-09-20 17:43 +0100
        Re: on cut edges and bonds, graph theory Daniel Bastos <dbastos@toledo.com> - 2017-09-21 16:20 -0300
          Re: on cut edges and bonds, graph theory Daniel Bastos <dbastos@toledo.com> - 2017-09-21 17:52 -0300
          Re: on cut edges and bonds, graph theory Ben Bacarisse <ben.usenet@bsb.me.uk> - 2017-09-21 22:02 +0100
            Re: on cut edges and bonds, graph theory Daniel Bastos <dbastos@toledo.com> - 2017-09-23 13:42 -0300

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