Sophie Huiberts

@sophie.huiberts.me

1403 Followers 437 Following

CNRS researcher in linear programming

"We are witnessing a computer revolution in which nearly all tasks of man— be they manual labor or simple control, pattern recognition or complex higher order decision making —all are being reduced to mathematical terms and their solution delegated to computers. It is in the latter development that linear programming (and its extensions) is playing a key role."
screenshot of wolfram alpha, where i ask 'quart to liter' and it gives me the information in the tweet. includes a helpful map of the countries, with an arrow pointing from quart to liter
Sophie sits on the couch and explains what a linear program is. On top of the video are playful hand-drawn animations to describe the size of the matrix and vectors. I had a good time making use of overshoot, where any movement first goes past where it is supposed to end before finally arriving where it meant to go.
Screenshot of promotional email Through a curated lineup of games, runners will showcase their skill with a series of impressive feats and challenging constraints. Some highlights include: - Hades II - Fresh File 2 Players 1 Controller o Fresh file is a challenging run starting with no unlocks, featuring two players and a single controller. They will have to stay in sync to complete the run! The email goes on after that. But notice that we are featured first!
GDQ schedule. Sunday August 30th has: Donkey Kong County All Stages (SNES) by Stormsn Skylar & Plux: Adventure on Clover Island Any %(PC) by Matse007 Hades II Fresh File 2 Players 1 Controller(PC) by ChelseaInSpace and sophie (!!!!!) Hollow Knight: Silksong Any% Cloakless(PC)imCYV The Legend of Zelda: Ocarina of Time Any% (Defeat Ganon) Blindfolded(N64 (Wii VC)) by Bubzia and more
George Dantzig wears a suit, as well as a name tag that says "George Dantzig". There's birthday decorations in the background, thats because this is from his 90th birthday party.
a reenactment of brian david gilbert video "when i make a good pun". i walk around in edinburgh, pointing at a street sign reading "Iona street" and later a pub called "Iona bar"
Various MIP solver logos surrounded by hearts
screenshot from paper. NEEDED: AN EMPIRICAL SCIENCE OF ALGORITHMS J. N. HOOKER Carnegie Mellon University, Pittsburgh, Pennsylvania (Received February 1993; revision received October 1993; accepted December 1993) Deductive algorithmic science has reached a high level of sophistication, but its worst-case and average-case results seldom tell us how well an algorithm is actually going to work in practice. I argue that an empirical science of algorithms is a viable alternative. [text continues, i suggest grabbing the paper instead of reading the screnshot]
Screenshot of text from Geometry of Isotropic Convex Bodies (2014) by Brazitikos, Giannopoulus, Valettas and Vritsiou. Proposition 3.2.12. There exists an absolute constant C > 0 such that for every isotropic convex body K in R^n and every θ ∈ S^{n−1} one has [nonsense], and hence for every t > 0 |{x ∈ K : |langle x, θ rangle| >= C L_K t}| <= 2e^{−t}.
Figure captioned as "Figure 6. Balls in various dimensions, and the slab that contains about 96% of each of them". This is a figure from An Elementary Introduction to Modern Convex Geometry by Keith Ball, 1997 The figure depicts three circles, vertically aligned by their centers. On top is the smallest one, titled "n=2". The middle one has radius around 2.8 times that of the top one and is titled "n=16". The bottom circle has radius 7.7 times the smallest one and is titled "n=120". Vertically across all three balls is a pair of dashed lines, indicating a slab. Visually, the smallest ball is covered almost completely, the middle ball is covered by about 1/3, and the largest ball looks like it is barely covered at all. What this depicts is that when we have balls in R^n of volume 1, then the radius is proportional to sqrt(n), but still you can cover almost the entire ball by a slab of constant width. A surprising fact, considering that this is not what you see in the picture.
pie chart titled "tools i use to get by in math research". 1/3 is "(undergrad) linear algebra", 1/4 is "probability theory + calculus (undergrad)", another 1/4 is "2D geometry (high school)" and the remainder is "fancy math (undergrad linear programming"
Logo of the workshop. The M of MIP is all curvy, the I has its dot on a rotated integer grid indicating integrality, and the P is made up of a linear outer approximation with its hole indicating the convex hull of integer points.
CPI Inflation Calculator $ 1,000,000.00 in February 2026 has the same buying power as $516,547.58 in January 2000
Fancy hair, has a beard, wears a suit. He has a purple bow tie wider than his head, and a brooch shaped like a spider with a big red stone in its bulb. He is a prominent mathematician, won the 2010 Fields medal.
A similar matplotlib scatter plot, but the colors are different. The blue is still blue, the horse is still white. The walls however are only 80% as red, and are located right up against the grid's boundary. The field is all a green-ish yellow. Closely enclosing the horse are two orange 'wall pieces'. Between water north and south, and the two orange walls left and right, are the horse in white and one yellow dot of properly enclosed field
a scatter plot drawn using matplotlib, with equally spaced circles on a square grid. The colors of the points indicate the map from the first tweet, with blue points for water, yellow points for enclosed area, green points for non-enclosed area, and red points for walls. exactly 10 walls are used, making maybe 40% of the field be enclosed with the horse inside
A 19x19 grid of squares, about 1/3 of which are water and 2/3 are grass. One square has a little white horse on it. The grass area is roughly circular, with many little lakes of various shapes and sizes. The grass reaches the boundary of the grid on 13 squares
Page from the linked document. It's all in Hebrew, I have trouble copy and pasting it. In the familiar alphabet we can read "Back Office", "OOTB", "CPLEX", "SMS" and "SLA". At the bottom is a link to IBM Knowledge Center, pointing to a page for IBM Business Automation Workflow on Content event types, the page looks unrelated to CPLEX
He said he has been locked in the same large, cold and damp room for 4½ months with more than 70 men. He said detainees are constantly hungry because meals served at tables in the centre of the room offer only child-sized portions. Fights often break out over food, “even over those little child-sized juice containers”. Toilet areas are “filthy”. He said there is little to do but lie on a bed all day. Most detainees do not speak any English. He said he has been allowed outside for air and exercise fewer than a dozen times in nearly five months. The atmosphere is full of “anxiety and depression”, he said.
picture of text. "Over 120 participants responded to our post-experiment survey and gave us consent, and the responses were very positive, with individuals citing the model's success at finding critical errors and its ability to return insightful commentary. In summary: • >80% of submitted papers at the time our experiment ended had opted-in for our Al review • 97% found the feedback helpful • 97% would use this tool again for future submissions • 81% found the model improved clarity or readability of the paper"
i hold a palm-sided 3d-printed grey example of a klee-minty cube in front of a plain white wall. at some point the camera image freezes on a single frame, after which i draw on the screen to indicate the exponentially long (2^3=8 vertices, where d=3 is the ambient dimension that my hand and my 3d print live in) simplex path
screengrab from the 3d modeling and animation software blender. first we see a cube, of which i click to highlight the 3 visible facets. then i draw an arrow into the viewport, placing it besides the cube. the arrow points top-right. then i use the texture drawing tool to draw a simplex path on the cube. it is very scuffed
Picture of text. "Hello everyone, welcome to the video. Today I will tell you about this recent paper I wrote with Eleon Bach. My name is Sophie Huiberts, and this is Optimal Smoothed Analysis of the Simplex Method. [jump to title card + music]" Another line of text is cut off near its top, being unreadable but suggesting that the script goes on below the clipping
picture of text. For this election and in accordance with the bylaws of the ACR, the three members of the ACR 2025 Election Committee acted as independent trustees, each holding a portion of the cryptographic key material required to jointly decrypt the results. This aspect of Helios' design ensures that no two trustees could collude to determine the outcome of an election or the contents of individual votes on their own: all trustees must provide their decryption shares. Unfortunately, one of the three trustees has irretrievably lost their private key, an honest but unfortunate human mistake, and therefore cannot compute their decryption share. As a result, Helios is unable to complete the decryption process, and it is technically impossible for us to obtain or verify the final outcome of this election.
collage of 9 solver logos surrounded by hearts. Logos are for: Google AI (for Glop, part of or-tools), Hexaly, Gurobi, MOSEK, SCIP (for SoPlex), OMP (turns out they have an in-house MIP code), HiGHS, Cardinal Optimizer, and FICO Xpress.
graph of subscriber count. its going big today
4 photos showing the same thing from different angles. a convex polyhedron made of glass, with black edges, is held in two hands. the hands wear white gloves, the polyhedron is wider than it is tall or deep. width is around 4 hands, other dimensions are about one and a half. inside the polyhedron is a orange ping pong ball, and is has found its resting spot at the bottom vertex. hence it solves the LP of minimizing height subject to being inside the polyhedron
two button meme but there is only one button. it says "PLEASE DO NOT PRESS" with "DO NOT" underlined and bold.
Infographic with some stock images. Nearly 7 in 10 organizations now rely on optimization for daily or real-time decisions What business problems are you currently solving with optimization?* Planning 56% Logistics 45% Supply Chain Planning 45% Production Planning 40% Energy Grid/Load Balancing 22% Pricing 15% *Respondents could select multiple options.
BY THE NUMBERS The Gaza Humanitarian Foundation (GHF) continued its operations today to provide vital food aid for the Palestinian people in Gaza. Below is an update on today’s operations: Distributed 21,600 boxes of aid today across three distribution sites: Location Truckloads Boxes Meals SDS2 (Saudi Neighborhood) 10 8,640 554,400 SDS3 (Khan Younis) 11 9,504 609,840 SDS4 (Wadi Gaza) 4 3,456 221,760 TOTAL 25 21,600 1,386,000 Approximately 99,949,482 meals distributed to date via roughly 1,662,040 boxes.
The first author of that paper was his own supervisor, Ailsa Land, who was still at the London School of Economics. But he did not know what had become of the second author. “All I know is that she was Australian and that she shares your name,” Gilbert said to me. Many years later, I started teaching optimisation (and her own branch-and-bound method) at the University of Melbourne. I always mentioned the mystery of this Australian woman who was my namesake and who had disappeared after publishing such an influential paper. After one of these classes, a student approached me and said, “Professor, there’s a tutor here named Alison. Maybe it’s her.” With little hope, I looked into it, and to my surprise, the tutor was indeed Alison Doig, now Alison Harcourt. My desire was to run, knock on each one of my colleagues’ doors and ask: “Do you know who that woman is?”.
Alex de Waal sits in front of his bookcases, speaks to Al Jazeera from Medford, Massachusetts. The banner on the bottom of the screen reads "Genocide by starvation: World Food Programma says Gaza's hunger crisis has reached new levels of desperation across the Strip" Partial transcript (char limit :( ) follows. He continues "This is preventable starvation, it is entirely man-made. Every stage of this has been predicted, and at every stage action could have been taken by Israel, by the international authorities, the international community, those who back Israel, to prevent what is happening now. Those steps have simply not been taken. In the last couple of months, what we saw was a total siege of Gaza, followed by a partial lifting. But the partial lifting was not to bring in the kind of humanitarian program that we have been familiar with as humanitarians over the decades. It was to bring in a type of ration program that is simply an arm of the Israeli military."
Article on APnews.com By JULIA FRANKEL and SAM MEDNICK Updated 1:28 AM GMT+2, July 3, 2025. Title: US contractors say their colleagues are firing live ammo as Palestinians seek food in Gaza The article starts with an embedded video. The caption under it says: American contractors guarding aid distribution sites in Gaza are using live ammunition and stun grenades as hungry Palestinians scramble for food, according to accounts and videos obtained by The Associated Press. Two U.S. contractors, speaking to the AP on condition of anonymity because they were revealing their employers’ internal operations, said they were coming forward because they were disturbed by what they considered dangerous and irresponsible practices. (Production: Luke Garratt) The first two lines of article text are visible and read: "BEERSHEBA, Israel (AP) — American contractors guarding aid distribution sites in Gaza are using live ammunition and stun grenades as hungry Palestinians scramble for food, according to accounts and videos obtained by The Associated Press."
tweet by GHF @GHFUpdates dated July 3rd, 9:38PM. text follows: "GHF response to recent report from Amnesty International: "In just five weeks, the Gaza Humanitarian Foundation has delivered over 58 million meals and one million boxes of aid directly to civilians in Gaza safely, consistently, and without interference from Hamas. Our mission Show more"
group picture of the workshop participants. its a crowd, 60 to 80 people i think
Alex with her slide. She has drawn cartoon pictures of various types of shapes and structures for the constraint matrix, along with the relevant parameters for which MIP is FPT
Johannes stands in front of a slide with figures and formulas. The title of the slide is "how many scenarios do we need"
Nadia standing in front of a whiteboard. She is a white woman with short greying hair. The text on the slide reads "Take a step back from decision-support tools As technical experts and analysts, OR practitioners are well placed to understand the limits, costs and possible effects of decision-support tools • Operations research as a profession, Churchman, 1970 • The social responsibility of operational research, Ackoff, 1974 With Odile Bellenguez and Alexis T soukias • Is there an ethical operational research practice? And what this implies for our research? 2023 • From decision aiding to the massive use of algorithms. where does the responsibility stand? 2024 • Teaching ethical, societal and environmental challenges of algorithms through a case study 2025 (in French) also with Christine Solnon"
headline by Haaretz: 'It's a Killing Field': IDF Soldiers Ordered to Shoot Deliberately at Unarmed Gazans Waiting for Humanitarian Aid
A map of the Gaza Strip. Marked are 3 major population centers: Mawasi with 0.5 million inhabitants, Central, ranging from Deir al Balah to Nuseirat, with 0.35 million inhabitants, and Gaza City with 1 million inhabitants. Most of the Strip is covered in red by militarized buffer zones, and Gaza City is separated from the southern 2/3rds by the Netzarim corridor. Four GHF compounds are marked, three in the west-most corner between Rafah and Mawasi, the last one north-east from An Nuseirat. All four compounds are located in the militarized buffer zones, where civilians are formally barred from going. No compound can be accessed from Gaza City.
screenshot of part of Israel's aid data portal, showing three sections https://gaza-aid-data.gov.il/main/ The first section lists aid entering through the maritime route, which happened March through September 2024. This data is split out in a bar graph for quantities per month, and a pie chart for the donor of the aid. In the middle section, we see another pie chart. This one is about all humanitarian donations, split out into 37.5% international organizations & NGOs, 35.8% UN Agencies, 19.2% private sector, 6.9% countries and a thin slice for mixed donors. The third section is a table of entries: date, route, classification (what type of aid), donor category, Aid (tons) and number of trucks. You cannot see it in the screenshot, but it is dated May 23rd 2025.
A map of the Gaza Strip. Marked are 3 major population centers: Mawasi with 0.5 million inhabitants, Central, ranging from Deir al Balah to Nuseirat, with 0.35 million inhabitants, and Gaza City with 1 million inhabitants. Most of the Strip is covered in red by militarized buffer zones, and Gaza City is separated from the southern 2/3rds by the Netzarim corridor. Four GHF compounds are marked, three in the west-most corner between Rafah and Mawasi, the last one north-east from An Nuseirat. All four compounds are located in the militarized buffer zones, where civilians are formally barred from going. No compound can be accessed from Gaza City.
tweet by COGAT @cogatonline We're taking major steps to support humanitarian efforts. More and more vital assistance is entering Gaza through two channels: - A new aid mechanism led by GHF has already delivered over 310,000 boxes of food directly to the people of Gaza. - Complementary aid continues to enter through the UN, helping widen the reach. In total, over 1,500 trucks loaded with essential supplies have entered Gaza recently. Aid for the civilian population, not Hamas.
tweet by COGAT @cogatonline: This week 350 trucks carrying humanitarian aid entered the Gaza Strip through the Kerem Shalom Crossing. The trucks carried food aid, including flour for bakeries. We will continue facilitating humanitarian aid for the civilian population. 7:49 PM • Jun 7, 2025 • 6,634 Views
table. Basic Products Daily truck movement, according to 106 Basic food Flour and yeast 10 Rice 5 Agriculture (fruit, vegetables and agricultural inputs) 18 Powdered milk and baby formula 3 Dairy products 10 Meat/poultry/fish 10 Legumes 2 Oil 5 Sugar 10 Salt 4 Total basic food 77 Other Products Other food products 11 Agriculture - agricultural inputs 2 Medicine 3 Medical equipment 3 Hygiene products 5 Essential humanitarian infrastructure products 5 Total 106
cogat tweet as usual. 121 trucks for wednesday
Black and white photo of Paula Harris. She is a white woman in very nice & professional clothes. She stands in front of a blackboard. On the blackboard are detailed schematics describing how to solve Mixed Integer Programs.
🚛95 trucks carrying humanitarian aid entered Gaza through the Kerem Shalom Crossing on Tuesday (May 27), following inspection. 🚛The trucks carried food, medical supplies and pharmaceutical drugs. 🚛We will continue facilitating humanitarian aid into Gaza while making every effort to ensure that the aid does not reach Hamas.
tweet by COGAT @cogatonline from 10 hours ago. Text follows: Monday (May 26) aid update: 🚛170 truck carrying humanitarian aid entered the Gaza Strip through the Kerem Shalom Crossing: ✔️Food aid ✔️Medical supplies ✔️Pharmaceutical drugs, including vaccines. We will continue to facilitate humanitarian aid into Gaza while making every effort to ensure that the aid does not reach the hands of Hamas.
tweet by COGAT @cogatonline. text follows: Yesterday (May 25): 🚛107 humanitarian aid trucks carrying flour for bakeries and food were transferred via the Kerem Shalom Crossing into Gaza following inspection. We will continue to facilitate humanitarian aid while making every effort to ensure that the aid does not reach the hands of Hamas.
tweet by COGAT @cogatonline. text follows: "What you should know: ➡️According to our current assessment, there is no food shortage in Gaza at this time. Food aid truck entries have been conducted in accordance with the situation assessment and in order to prevent any shortages." The rest of the tweet is hidden under a "read more"
picture of tweet by COGAT @cogatonline. text follows: "🚛107 trucks carrying humanitarian aid by the UN and the international community, including flour, food, medical equipment and pharmaceutical drugs, were transferred yesterday (May 22) via the Kerem Shalom Crossing into the Gaza Strip after security inspection. We will continue facilitating humanitarian aid into Gaza while making every effort to ensure that the aid does not reach the hands of Hamas."
Picture of text from The Times of Israel, 3 paragraphs. One paragraph has a highlighted sentence by me and reads "A calculation by the WFP regarding the amount of aid currently waiting at the Gaza border and how long it would feed Gazans appeared to indicate, however, that the food that entered Gaza between January 19 and March 2 should suffice for the population’s needs until the middle of July." Full text in the screenshot follows: "On Monday, the Integrated Food Security Phase Classification (IPC) organization said “the Gaza Strip is still confronted with a critical risk of famine,” and that “the entire population is facing high levels of acute food insecurity, with half a million people [one in five] facing starvation.” Citing the report, UN World Food Programme executive director Cindy McCain said “families in Gaza are starving” and that it was “imperative” to get aid flowing again. A calculation by the WFP regarding the amount of aid currently waiting at the Gaza border and how long it would feed Gazans appeared to indicate, however, that the food that entered Gaza between January 19 and March 2 should suffice for the population’s needs until the middle of July."
Picture of text from the WFP website, 4 paragraphs. A single sentence is highlighted by myself and reads "116,000 metric tons of food assistance – enough to feed one million people for up to four months". Full text in the picture follows: "The vast majority of children in Gaza are facing extreme food deprivation as confirmed by 17 UN agencies and NGOs in the IPC report. Coupled with the severely limited access to health services and critical shortages of clean water and sanitation, rapid increases in acute malnutrition are expected in North Gaza, Gaza and Rafah governorates. “The risk of famine does not arrive suddenly. It unfolds in places where access to food is blocked, where health systems are decimated, and where children are left without the bare minimum to survive. Hunger and acute malnutrition are a daily reality for children across the Gaza Strip,” said UNICEF Executive Director Catherine Russell. “We have repeatedly warned of this trajectory and call again on all parties to prevent a catastrophe.” Border crossings into Gaza have been closed for over two months - the longest the population has ever faced – causing food prices in markets to spike to astronomical levels, putting what little food is available out of reach for most families. At the same time, more than 116,000 metric tons of food assistance – enough to feed one million people for up to four months - is already positioned in aid corridors, ready to be brought in. Hundreds of pallets of lifesaving nutrition treatments are also prepositioned for entry. United Nations agencies stand ready to work with all stakeholders and food security partners to bring in these food and nutrition supplies and distribute it as soon as borders reopen for principled aid delivery."
Figure from the IPC report titled "Current Acute Food Insecurity | 1 April - 10 May 2025". The left-hand side of the figure reports that "About 1.94 million people across the Gaza Strip are experiencing high levels of acute food insecurity classified in IPC Phase 3 or above (Crisis or worse) between 1 April and 10 May 2025, including nearly 244,000 people facing catastrophic food insecurity (IPC Phase 5)." The right-hand side has large letters indicating that "93% of the analysed population in the Gaza Strip is in IPC Phase 3 or above". Below that is a pie chart splitting out a 2.1M population into: Category 1 - None : 0% Category 2 - Stressed: 7% Category 3 - Crisis: 37% Category 4 - Emergency: 44% Category 5 - Catastrophe: 12%
product photo. a blue plastic box has a wire sticking out the bottom, the side facing way from us presumably contains a camera module. this unseen camera looks from closeby at a long narrow strip, going up and down past the bounds of the picture. the strip has white and blavk squares on it, some random looking and some visible structure. it reminds me of a QR code that is 1000 times taller than it is wide. the strip measures 10 squares horizontally
Each hub would serve 5,000 to 6,000 households. Representatives of those households would pick up a 44-pound parcel of food and hygiene items every two weeks, according to one international aid worker. Another person briefed said aid would be picked up weekly.