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Operations Research

Mathematics Thu Jul 19 2018 00:46:28 GMT+0000 (UTC)
WHERE THE PARTY'S AT -- [The infinitesimals] neither have nor can have theory; in practise it is a dangerous instrument in the hands of beginners ... anticipating, for my part, the judgement of posterity, I would predict that this method will be accused one day, and rightly
Let be a measure-preserving system – a probability space equipped with a measure-preserving translation (which for simplicity of discussion we shall assume to be invertible). We will informally think of two points in this space as being &am
On Monday, Vladimir Putin said hed given Donald Trump a note with suggestions on disarmament. This might be the first move in extending an important agreement
The following are some of the multiple questions from the recent June 2018 New York State Common Core Geometry Regents exam. The answers to Part I can be found here June 2018 Geometry, Part II Each correct answer is worth up to 2 credits. Partial cre
Math is the only place where truth and beauty mean the same thing.-Danica McKellar(I can't believe I'm doing math quotes by "Winnie" from Wonder Years)The 199th day of the year; 199 is prime (in fact, all three permutations of the number are prime) a
It’s carnival time again. Activities, games, lessons, hands-on fun — if you’ve written a blog post about math, we’d love to have you join our Playful Math Blog Carnival. Posts must be relevant to students or te
It's never been a better time to work on AI/ML. Vast resources are being deployed in this direction, by corporations and governments alike. There are nontrivial discoveries being made, and a theoretical understanding of Deep Learning may emerge in th
In Supplement 11, we discuss the risks of natural disasters (such as the Japanese tsunami) to global supply chains. But as Supply & Demand Chain Executive (July 13, 2018) rightly points out, todays supply chains, though increasingly efficient
The following are some of the multiple questions from the recent June 2018 New York State Common Core Geometry Regents exam. June 2018 Geometry, Part I Each correct answer is worth up to 2 credits. No partial credit. Work need not be shown. 1. After
In this post I will talk about Building Bridges II – last week conference in Budapest, about my talk and Lex Schrijver’s talk at the conference, about two old videotaped lectures in Microsoft Research (and a prize carrying competi
Science is built up with facts, as a house is with stones. But a collection of facts is no more a sciencethan a heap of stones is a house. ~Henri PoincarThe 198th day of the year; 198 is a Harshad number, divisible by the sum of its digits.
Minuscule machines that act as sensors in smartphones and other devices can be made from crystals extracted from discarded wood instead of silicon
Vlad just sent me the following: Hi Igor,I am writing regarding a paper you may find of interest, co-authored with Paul Hand and Oscar Leong. It applies a deep generative prior to phase retrieval, with surprisingly good results! We can show
Life science teaches us to answer everything from “How can vaccines be used to indirectly protect people who haven’t been immunized?” to “Why are variations in eye color almost exclusively present among humans
I am preparing for my first sabbatical in 2019-2020. It’s been awhile since I’ve blegged, but I’m a bit behind schedule on planning due to the demands of my administrative role. I am turning to my blog for the wisdom of
I'm Reposting some old blogs to try and preserve some notes,  and do some editingIn my youth, back in the dark ages before calculators, one of the common mathematical tools we were taught was called casting out nines. It seems it is not comm
Wounds and burns could one day be treatedby the material spiders use to make their webs
The following are some of the multiple questions from the recent January 2018 New York State Common Core Algebra I Regents exam. The answers to Part I can be found hereThe answers to Part II can be found here June 2018 Algebra I, Part III Each correc
Factories in the southern Chinese city of Dongguan once employed what one employee called a magnificent sea of people. But rising labor costs and a new generation of Chinese with little interest in toiling in factories forced a new tack, reports The
This summer I am again spending at the Radcliffe Institute for Advanced Study at Harvard University where I am a Summer Fellow. I have been busy working on a project on perishable product supply chains from food to blood.Last summer I was also at Har
Sanjeev is giving a tutorial at ICML entitled Toward theoretical understanding of deep learning. the presentation and all the references are all on this page. (and yes compressive sensing shows up in different parts) Join the Compre
Repost of an old blog about British vernacular" In 1887 Oscar Wilde wrote: `We have really everything in common with America nowadays except, of course, language'. Some say he may have been paraphrasing something by George B. Shaw. Whichever
For the first time, we have traced a high-energy neutrino back to its origin - a black hole 4 billion light years away - and solved an old cosmic mystery
The following are some of the multiple questions from the recent January 2018 New York State Common Core Algebra I Regents exam. The answers to Part I can be found here June 2018 Algebra I, Part II Each correct answer is worth up to 2 credits. Partia
The figure below shows the correlation between SNP-based polygenic score and life outcome (socioeconomic index) in four longitudinal cohorts, one from New Zealand (Dunedin) and three from the US. Each cohort (varying somewhat in size) has thousands o
It is my honor to announce that Mario Fusco will be taking over as the new Drools Project Lead.Mario is a Principal Software Engineer at Red Hat, working on the development of the Drools core. He has vast experience as a Java developer, and among oth
Visual poetry by Mathemusician Larry Lesser:These diagrams are part of a paper by L.M. Lesser found here.
It's been five months, already, here is what we featured on Nuit Blanche since the last Nuit Blanche in Review (Janvier 2018). During that time, Mila Nikolova left us. Here are some other things that happened.ImplementationsFast Con
Pure mathematics is the world's best game. It is more absorbing than chess, more of a gamble than poker, and lasts longer than Monopoly. It's free. It can be played anywhere - Archimedes did it in a bathtub.-Richar
Weve no clue how our solid world crystallises from fuzzy quantum weirdness. A mysterious experimental noise could now be giving us our first hints
(Click on the comic if you can't see the full image.) (C)Copyright 2018, C. Burke. And so only two rockets made it to Earth ... Come back often for more funny math and geeky comics.
Just outside Teslas sprawling electric-car Fremont, Calif. plant, an unusual structure has taken shape in the past few weeks: a tent, about 50 feet high and several hundred feet long. Its purpose is as notable as its hasty construction, writes The Ne
XKCD’s Friday comic concerned the On-line Encyclopedia of Integer Sequences. Take a look! Advertisements XKCD’s Friday comic concerned the On-line Encyclopedia of Integer Sequences. Take a look!
Let , be additive groups (i.e., groups with an abelian addition group law). A map is a homomorphism if one has for all . A map is an affine homomorphism if one has for all additive quadruples in , by which we mean that and . The two notions are close
Learn how to solve two types of logarithmic equations
Mathematics is as much an aspect of culture as it is a collection of algorithms.-Carl Boyer The 196th day of the year, A Lychrel number is a natural number which cannot form a palindromic number through the iterative process of repeatedly reversing i
Our best theory of physical reality is exquisite but inexplicable. A low, unexplained experimental noise could herald a revolution in the making
(Click on the comic if you can't see the full image.) (C)Copyright 2018, C. Burke. An Academy has to start some place, right? Come back often for more funny math and geeky comics.
So the conference is over; but before I start a description of the last two days, let me pose a problem which might be an interesting small research topic for someone. As I have said, statisticians love symmetric real matrices. … Continue r
On the floor at Katerras cavernous 250,000-square-foot Phoenix factory, workers and robots hammer pallets of Douglas fir into finished wall panels and put them on an assembly line, where other machines and craftspeople add windows and plumbing before
The standard Raspbian software on the Raspberry Pi comes with a basic implementation of Minecraft and a full implementation of the Wolfram Language. Combining the two provides a fun playground for learning coding. If you are a gamer, you can use the
Caltech researchers used elastic net (L1 and L2 penalization) to train a predictor using cognitive scores and fMRI data from ~900 individuals. The predictor captures about 20% of variance in intelligence; the score correlates a bit more than 0.45 wit
Antoine Caron: Astronomers Studying an Eclipse *TIA Nature is not embarrassed by difficulties of analysis.~Augustin FresnelThe 195th day of the year..195 is the sum of eleven consecutive primes: 3 + 5 + 7 + 11 + 13 + 17 + 19 + 23 + 29 + 31 + 37 Stude
Inspired by the liquid metal robot T-1000 in Terminator 2, researchers have made gallium droplets that beat likes hearts and could be used to power artificial muscles
Check out the latest carnival of playful math for all ages: Math Teachers at Play #118 Each monthly carnival brings you a great new collection of puzzles, math conversations, crafts, teaching tips, and all sorts of mathy fun. It’s like a fr
After the rush of the first two days, things quietened down a bit, so I can stop and look around me. The conference logo, and an explanation, is here. Norman Biggs, one of the pioneers of algebraic graph theory, speculated … Continue readin
(Click on the comic if you can't see the full image.) (C)Copyright 2018, C. Burke. Happy Independence Day! I'd love to include a scene from the movie "1776", just because it's so much fun, but how to do that legally? Maybe just down one of their song
I was in Philadelphia a couple of weeks ago with AB and we went to the brand-newMuseum of the American Revolution. It’s a great work of public history. Every American, and everybody else who cares about America, should see it. The museum sc
Once more, I have yielded to the arch-Tempter, the Book-Buying demon. This time, it star