Profile cover photo
Profile photo
David Roberts
19,132 followers -
Mathematician, among other things (husband, avid reader, cyclist, Christian,...)
Mathematician, among other things (husband, avid reader, cyclist, Christian,...)

19,132 followers
About
David's posts

Post has attachment
Does anyone know anything about this workshop, or know anyone who does?

https://www.maths.nottingham.ac.uk/personal/ibf/j17.html

cc +Taylor Dupuy

#IUTT #MochizukiABC #anabeliangeometry

Post has attachment
Blog post by physicist Tommaso Dorigo.

Post has attachment

Post has attachment
You know that super-secret deal that the Netherlands got with Elsevier to publish stuff open access? Here the details, which the big E has essentially been suing to keep secret. The "pilot" (presumably on which Elsevier will base further statements of "people don't want it" and claim perfect objectivity) doesn't have a whole lot of uptake, but that's no surprise when the details are forthcoming.

Post has shared content
Via +Benoît R. Kloeckner​. A "referee report" on a funding proposal.
Below, I’ve taken the liberty to “peer-review” recent proposals to ‘flip’ subscription journals to open access The applicants have provided an interesting proposal of how to ‘flip’ the current subscription journals to an article processing charges…

Post has shared content
Scroll down to "Publication Ethics and Publication Malpractice Statement". Relatively few independent mathematics journals spell out their policies in this way, but they ought do. Well done Discrete Analysis!

Post has shared content
Abel Prize Announced

Congratulations to Yves Meyer (École normale supérieure Paris-Saclay, France) winner of the 2017 #AbelPrize! http://www.abelprize.no/nyheter/vis.html?tid=69588

Post has shared content
Learn more about Karen Smith, mathematician at the University of Michigan, and read some reviews of her work on Beyond Reviews:

Post has shared content
Homological algebra in characteristic one

Alain Connes, Caterina Consani

This article develops several main results for a general theory of homological algebra in categories such as the category of sheaves of idempotent modules over a topos. In the analogy with the development of homological algebra for abelian categories the present paper should be viewed as the analogue of the development of homological algebra for abelian groups. Our selected prototype, the category Bmod of modules over the Boolean semifield B is the replacement for the category of abelian groups. We show that the semi-additive category Bmod fulfills analogues of the axioms AB1 and AB2 for abelian categories. By introducing a precise comonad on Bmod we obtain the conceptually related Kleisli and Eilenberg-Moore categories. The latter category Bmod^s is simply Bmod in the topos of sets endowed with an involution and as such it shares with Bmod most of its abstract categorical properties. The three main results of the paper are the following. First, when endowed with the natural ideal of null morphisms, the category Bmod^s is a semi-exact, homological category in the sense of M. Grandis. Second, there is a far reaching analogy between Bmod^s and the category of operators in Hilbert space, and in particular results relating null kernel and injectivity for morphisms. The third fundamental result is that, even for finite objects of Bmod^s the resulting homological algebra is non-trivial and gives rise to a computable Ext functor. We determine explicitly this functor in the case provided by the diagonal morphism of the Boolean semiring into its square.

Post has attachment
When I went to graduate school at Boston University, I joined an experimental lab. I spent the whole year basically designing a flange for a sputtering chamber. I was not inspired. I like puzzles, I like computers, I like math. One day the vacuum pump blew up on me and I was covered in pump oil. And I came walking out of the lab, and a professor, Gene Stanley, saw me and said, “You look like a theorist; come talk to me.” By the end of the day I had switched and joined his group and it was one of the most life-changing decisions I ever made.
Wait while more posts are being loaded