Path: csiph.com!eternal-september.org!feeder.eternal-september.org!news.eternal-september.org!.POSTED!not-for-mail From: Ben Bacarisse Newsgroups: comp.programming,alt.algebra.help Subject: Re: on cut edges and bonds, graph theory Date: Thu, 21 Sep 2017 17:03:57 +0100 Organization: A noiseless patient Spider Lines: 77 Message-ID: <87fubgghsi.fsf@bsb.me.uk> References: <86wp4w3sz5.fsf@toledo.com> <87shfjpzgs.fsf@bsb.me.uk> <878thaq4ff.fsf@bsb.me.uk> <87efr17b3g.fsf@bsb.me.uk> Mime-Version: 1.0 Content-Type: text/plain Injection-Info: reader02.eternal-september.org; posting-host="82804c28d500e09ff9d07e64dec1e385"; logging-data="1729"; mail-complaints-to="abuse@eternal-september.org"; posting-account="U2FsdGVkX1+Y4avwbAhWUjtcJUBwex6nyrc0E7wajCQ=" Cancel-Lock: sha1:f1xDCFAkzE/Xx3n4kJ7135y7v0I= sha1:ZvMlU5N9k2ysiKIe/g1tCyU0fvo= Xref: csiph.com comp.programming:8020 alt.algebra.help:5008 William Elliot writes: > On Wed, 20 Sep 2017, Ben Bacarisse wrote: >> William Elliot writes: >> > >> >> >> ... The book uses an over bar for that case: [S, S?E]. >> >> >> >> >> >> For [A, B] to be an edge cut, A ?H? B = V, A ?H? B = {}, A =/= {} and >> >> >> B =/= {}. >> >> > What does S?E and ?H? mean? >> >> >> >> They means that some software has had trouble with the Content-Type of >> >> my post. They are the transliteration chosen by that software for byte >> >> sequences representing a combining overline, set union and set >> >> intersection. >> > >> > Usenet is old fashion. Such stuff doesn't communicate well. > > It worked much better than the new fangled stuff. > One example is mathstack. Eh? I post on Usenet because it works well -- much better than mathstack. >> I prefer to think of some software as old fashioned. With a little >> help, Usenet is fit for the 21st Century. > > The new fangled stuff might work better were it designed better, > standardized special characters and didn't throw in the kitchen sink, > ie cram it with too much stuff. When it comes to standards, it's inevitable that many people -- even most -- will be disappointed. But it's done now and it works well enough. >> > We use various other plain text symbols for intersection and union. >> >> Who is "we"? > > Those of us who wrote, learned and taught math in plain text ascii on > Usenet. Ah, right. It's an odd word to use since I too learned that but I appear not to be included in the "we". (A word of caution in case you don't know... It can come over as rather grand to say "we do X" when you just mean that you are among the set of people who do X.) > TeX is a hideous language to have to write. Often writing > out the math in English is more proficient than writing TeX. > > I have notice that over the years, as I was forced to modernized, that > my productivity has fallen for being hampered by all that new fangled > stuff. Windows as an operation system is a disaster designed for > dummies who won't have to be bother learning how to use an effective > operating system. Now the computer, with mikes and cameras, is just a > spy in your home. The web is going from an excellent means of > communication to a piece of commercial trash, much the same way > that radio and TV has but with the added advantage of spying on you > by both corporations and governments. Now under the rubric of fake > news, people are being censored; left wing groups among others are > targeted. So like the radio and TV - just silly entertainment, ads > and government propaganda - the web is becoming such. > > New and improved is never as good. Oh, OK. That's not been my experience. My new and improved CPU is way better than the one in the DG Nova I first used, and it does not need cooling water like the IBM 370 either. I much prefer to type into Emacs than punch cards or tapes. I love my delete key -- re-punching cards was a royal pain, despite the handy DUP key. In fact, I don't know how we could even be having the conversation on the kind of machine I started on. -- Ben.