Timothy Gowers @wtgowers Profile picture
Sep 13, 2020 8 tweets 2 min read Read on X
Another mass resignation of an editorial board has happened, and this one feels like quite a big deal, as the journal in question is Journal of Combinatorial Theory A, one of Elsevier's premium combinatorics journals. 1/

math.sfsu.edu/beck/ct/index.…
A new journal, called, simply, Combinatorial Theory, is now accepting submissions. It will be free to read and free to publish in. And it would like to be thought of as the "true" continuation of JCTA. 2/
If the past is anything to go by, it is likely that JCTA will limp on for a while. If you are a combinatorialist and want to help Combinatorial Theory, then please submit the papers you would have submitted to JCTA to Combinatorial Theory. 3/
Or if, like me, you are a combinatorialist who refuses to submit papers to Elsevier journals, then rejoice that there is now one more combinatorics journal that you can submit to with a completely clean conscience. 4/
And please do not agree to serve on the editorial board of JCTA if asked. If the new journal succeeds, it will demonstrate to other journals that becoming independent is not something to be afraid of. 5/
And it makes sense anyway. If you are asking yourself which of the two candidates you should think of as the true continuation of JCTA, do you want the one with the same name or the one with the same editorial board, with all its institutional memory? It's a no-brainer. 6/
The Journal of Combinatorial Theory was founded by Gian-Carlo Rota in the 1960s, and published by Academic Press, later bought by Elsevier. If it's not against your principles to look, a short history can be found in an Elsevier article that isn't behind a paywall. 7/
Some might say that it's a pity that half of Rota's journal is losing its name and weakening its link with Rota. I can hardly believe Rota himself would have taken that attitude if he had lived to see what happened to academic publishing. 8/8

reader.elsevier.com/reader/sd/pii/…

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More from @wtgowers

Nov 20, 2023
Today I start my seventh decade, so here are a few reflections on what it's like to reach that milestone. 🧵
1. I've had an extremely fortunate life so far. Of course, nobody reaches the age of 60 without some bad things happening, but I've had a lot less bad than my fair share and a lot more good.
2. With each passing decade I get that much more aware of the finiteness of my life, but turning 60 is a big step up in that respect from turning 50. I have people basically my age talking about retirement, for example.
Read 20 tweets
Oct 19, 2023
My son has just started calculus, and I asked him what the relationship was between the gradients of the tangent and the normal to a curve at a given point. His first reply was, "They are perpendicular." I've noticed many times that something one gains with experience ... 1/7
in mathematics is an acute sensitivity to types. An experienced mathematician could not give that answer, for the simple reason that gradients are real numbers and two real numbers cannot be perpendicular to each other. 2/7
It didn't take long for him to correct himself and give the answer I had been looking for, but the point remains: get someone into the habit of being aware of the type of everything they are talking about, and their mathematical thinking automatically becomes much clearer. 3/7
Read 7 tweets
Jul 16, 2023
I have often seen statistics like this, and am very much in favour of curbing the high-emitting activities of the rich (and while there are plenty of people richer than I am, I am not excluding myself from the people whose emissions must be curbed).

But ... 1/
there is an important calculation that economists must have done somewhere, which I have not managed to find, concerning what the effects would be on emissions of a big redistribution of wealth. 2/
On the face of it, the argument looks simple: the rich are responsible for the lion's share of emissions, so if we redistributed in such a way as to bring the rich down to a lower level of wealth, we would have made big progress, by dealing with that lion's share. 3/
Read 15 tweets
Jun 8, 2023
It's an amazing time to be alive for a combinatorialist at the moment, with a number of long-standing problems, several of them personal favourites of mine, being resolved. Today I woke up to the news of yet another breakthrough, due to Sam Mattheus and Jacques Verstraete. 🧵
A month or two ago I tweeted about a stunning new result that obtained an exponential improvement for the upper bound for the Ramsey number R(k,k), a problem I had thought about a lot. When I felt stuck on that, I would sometimes turn my attention to a related problem
that felt as though it ought to be easier: estimating the Ramsey number R(4,k). This is the smallest n such that every graph contains either a K_4 (that is, four vertices all joined to each other) or an independent set of size k (that is, k vertices not joined at all).
Read 10 tweets
Mar 17, 2023
I was at a sensational combinatorics seminar in Cambridge yesterday, reminiscent of the time I had been tipped off that Andrew Wiles's seminar at the Newton Institute on Wednesday 23rd June 1993 might be worth going to. 🧵

arxiv.org/abs/2303.09521
The speaker was my colleague Julian Sahasrabudhe, who announced that he, Marcelo Campos, Simon Griffiths and Rob Morris had obtained an exponential improvement to the upper bound for Ramsey's theorem. Image
Ramsey's theorem says that for any number k there is a number R(k) with the property that if you have R(k) people in a room and any two of them are either friends or enemies, then you can find k people who are either all friends of each other or all enemies of each other.
Read 15 tweets
Aug 30, 2022
For a while now I’ve wanted a rule of thumb that would allow me to estimate the amount of harm that would result from various carbon-emitting activities I might take. I’ve now thought of one (unlikely to be original) that I find satisfactory, though it needs refining.🧵 1/26
What I have found hard about the question up to now is that an activity such as taking a plane flight will be adding just a tiny percentage to the amount of carbon in the atmosphere, making an almost undetectable difference. And yet all these contributions add up. 2/26
Of course, the consequences of the tiny difference I make will be felt by billions of people, so they add up to something significant. What I now see is that there’s a simple way of avoiding having to divide by a large number and then multiply by a comparably large number again.
Read 26 tweets

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