99 search results for “geometry of number” in the Staff website
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Leiden University’s intake numbers are stable, also for international students
The number of students enrolled at Leiden University remained stable this year. As at other Dutch universities, the growth in recent years seems to have levelled off. Leiden University is also following the national trend in terms of intake at the bachelor’s and master’s levels. The number of international…
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Svetlana Kharchenkova on The Diplomat about decreased number of U.S. books in China
The number of books by U.S. authors released in China has drastically decreased in recent years. Assistant professor Svetlana Kharchenkova wrote an article about this for the Diplomat.
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From the griffon vulture to Physcia biziana: record number of rare species in campus BioBlitz
What a result! The Higher Education BioBlitz recorded 3,155 species, smashing our target of 2,500. Thanks to your efforts, Leiden University made an impressive eight ‘very rare’ finds. A result that gives hope for our biodiversity.
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The number of threats is increasing. But is the Netherlands less safe?
Explosions at people’s homes, gangland killings and online threats: if you follow the news, it may seem as though threat levels in the Netherlands are rising. But is that really true? Researchers from Leiden University investigated this and have presented their results in the Dreigingsmonitor (Threat…
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New professor David Holmes engages with age-old counting problems
As of 1 October, David Holmes has been appointed full professor of Pure Mathematics at the Mathematical Institute (MI). His work lies at the intersection of algebra, geometry and number theory.
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Sovereign debt as strategy: Kathleen Brown on the politics behind the numbers
On Tuesday 30 September 2025, PhD candidate Kathleen Brown will defend her dissertation 'Deception, Risk, and Evasion: The Politics of Sovereign Debt in Emerging Markets' in Leiden’s Academy Building. Her research sheds light on the hidden world of sovereign debt politics, revealing how governments…
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The annual interview is changing: from scores and numbers to more human dimensions
Speaking with your manager more often, focusing explicitly on well-being and giving more recognition and rewards for teamwork and team performance: the annual Performance & Development (P&D) interview will have a new format and also a new name. With the acronym GROW (Gesprekken over Resultaat, Ontwikkeling…
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Honourable mention for Rosa Schwarz at Christiaan Huygens Prize 2024
During the award ceremony of the Christiaan Huygens Prize on 16 October, mathematician Rosa Schwarz received an honourable mention. Schwarz, former PhD candidate of the Mathematical Institute, received the mention for her dissertation ‘Logarithmic approach to the double ramification cycle’.
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Tailoring support for refugee students: ‘They are amazed at the number of options’
Many people have fled to the Netherlands since the outbreak of war in Ukraine, including students. But even before this war, students with refugee backgrounds were eager to study at Leiden University. How does the University help young people from various backgrounds find their way around the Dutch…
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Rubicon grant for Leiden physicist: why do leaves of a tree always grow in the same shape?
PhD candidate Ludwig Hoffmann will spend two years at Harvard University in the US thanks to a Rubicon grant he won on April 11. Using theoretical models he studies biological tissues, for example during morphogenesis. This is the process that causes tissue or organisms to develop their shape. ‘This…
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Two ERC Consolidator Grants for Leiden researchers
Two Leiden researchers have been awarded a Consolidator Grant by the European Research Council (ERC). This grant of up to 2 million euros will enable them to continue and develop their research.
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In Memoriam - Bas Edixhoven
On January 16, 2022, our respected and beloved colleague Prof. dr. Bas Edixhoven passed away after a short period of serious illness.
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Sensitivity labels now automatically applied in Microsoft 365
ICT, Security
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Exhibition shows the ‘beauty and power’ of mathematics
In the ‘Imaginary’ exhibition, its curators show how society is made up of mathematics. From algorithms that save lives to ones that generate art. The exhibition is from 2 June to 25 July at Oude UB in Leiden.
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‘As long as the logic works, you can do whatever you want’
With a healthy dose of logic and creativity, mathematics student Lance Bakker shows how computers can prove complex mathematics. His method proves intricate formulas without calculating every intermediate step. It earned him a nomination for the Leiden Science Young Talent Award 2025.
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lab, we often don't realise that we are working to help an immense number of patients'
'It gave our team a big boost to hear that our work was valuable,' says medical chemist Elmer Maurits about the moment they won the Venture Challenge. With their company Iprotics, they want to develop a drug that can better treat patients with autoimmune diseases and blood cancers. 25,000 euros of prize…
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Black hole one year later: proof of a persistent shadow
The brightness peak of the ring around M87's supermassive black hole has shifted 30 degrees counterclockwise in a year. This is shown by new images released by the Event Horizon Telescope consortium.
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Disentangling ghost segments and number marking in Sengwer
Lecture, This Time for Africa! series
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70 years Mathematical Institute - growth, prosperity and (mathematical) challenges
Floreat et crescat. Flourish and grow. That was what was wished for the Mathematical Institute at its opening. Now, the institute proudly celebrates its 70th anniversary. Time to reflect on how it all began. And importantly, how is it doing now?
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Dirk Bouwmeesterbouwmeester@physics.leidenuniv.nl | 071 5275892
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Tazuko van Berkel receives Ammodo Science Award
University lecturer Tazuko van Berkel is one of this year's laureates of the Ammodo Science Award. The award includes a sum of 350,000 euros that she can use as she wishes to explore new avenues in basic scientific research.
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Meet Faculty Council member Sonia Leffel: ‘We are here for you.’
The Faculty Council is the main consultation and advisory body within the Faculty of Archaeology. Three students and three staff members together represent the Faculty community, advising the board, as well as taking the initiative to put things on the agenda. We speak with council member, and bachelor's…
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Jan Vonk appointed full professor of Mathematics at the Mathematical Institute
As of 1 November, Jan Vonk has been appointed full professor of Mathematics at the Mathematical Institute (MI). The institute is delighted with Jan’s appointment, as is he. ‘At the MI we combine the abstract with the concrete like no other.’
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From equations to excursions: Leiden students excel at International Maths Competition
Five mathematics students from Leiden University and their coach stood out this summer in Bulgaria at the IMC: the International Mathematics Competition for university students. Lance, Ryan, Casper, Mads and Lars tackled tough maths problems and also made the most of the Bulgarian sunshine.
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Three Leiden researchers receive NWO Open Competition grant for innovative science
Sustainable biotechnology, new insights into genome evolution and combining forces in mathematics. The NWO has awarded grants to these three innovative Leiden research projects in the ENW-M Open Competition.
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Executive Board visits institutes: ‘We want to talk to our colleagues in the place where it all happens’
Board members Annetje Ottow and Hester Bijl recently visited the Leiden University Centre for Linguistics (LUCL, Faculty of Humanities) and the Mathematical Institute (MI, Faculty of Science). This was the start of a series of visits to institutes at our university. The focus is on talking to researchers…
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Article from 1984 remains a hit: citation count passes 10,000
It was already the most cited publication ever written at our faculty, but now a new milestone has been reached. Last month, a paper by emeritus professor Jan Reedijk and his co-authors surpassed 10,000 citations — and the count keeps rising.
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Six Leiden researchers receive ERC Starting Grant
Six researchers from Leiden University have received an ERC starting grant. This grant of on average 1.5m euros will enable the researchers to launch their own project, form their own research team and develop their best ideas.
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Four Leiden consortia awarded large NWO grants
No less than four Leiden research teams have been awarded a grant by NWO. On 27 July NWO honoured 21 applications in the Open Competition ENW-XL. NWO awards the grants to consortia in the exact and natural sciences who are doing unconnected fundamental research that is 'driven by curiosity'.
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Cattle, rather than geometric shapes, determine how the Hamar see the world
Sara Petrollino, a university lecturer in linguistics, strongly believes that language influences the way we see the world. An NWO Open Competition (XS) grant will enable her to test this hypothesis among the Ethiopian Hamar people. ‘The idea that everyone thinks in geometric shapes is culturally de…
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of Empathy in International Development Work: Beyond Policies and Numbers
Lecture
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‘If you understand the risks, AI is an incredible tool’
Thomas Moerland studied medicine and mathematics in Leiden and has a lifelong fascination with the origins and workings of intelligence. He brought all that together in his popular science book Van IQ naar AI (From IQ to AI).
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Algebra, activism and asbestos: the curious life of Fred Rohde
As a mathematician, Fred Rohde (1948) explored the world of numbers. As a photographer, he captured demonstrations. And now he’s reconstructing his mother’s wartime story – an extraordinary tale of her stay with an Austrian family, the inventors of asbestos cement.
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Research Traineeship Programme completed: 'Here you are encouraged to try things'
Discovering while still studying whether work in science might be for you. That is what students get during the faculty Research Traineeship Programme. On Friday 1 September, they presented their results to each other and their supervisors.
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Digits & Deviations of Dynamical Systems
PhD defence
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90 years of labour law in Leiden: Evolving with the times
Labour law professors have shaped research and education in Leiden since 1936. From the rise of trade unions to the AI revolution, the field has constantly evolved. Major changes are on the horizon again in 2026. 'Labour law will always be important.'
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Certainty in uncertain times
Lecture, MI 70 years
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Mathematics across borders: Peter Stevenhagen in Pakistan
Peter Stevenhagen delivered daily lectures at the Syed Babar Ali School of Science and Engineering in Lahore, in collaboration with ICTP, a well-known UNESCO institute in Trieste. The aim is to enhance it he knowledge of students from low- and middle-income countries. ‘By teaching here, I can truly…
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Mathematics student Alex Colling: ‘Bachelor’s thesis was highlight of my time in Leiden’
Alex Colling himself calls his bachelor's thesis ‘the highlight of his time in Leiden’. And according to his supervisors, that resulted in an outstanding thesis, with great attention to detail. The Mathematics and Physics student worked on a mathematical description of monopoles: hypothetical particles…
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Maths + match = medals! Leiden students win five medals at international math competition
Two Second Prizes, two First Prizes and even a Grand Grand First Prize. Five Leiden mathematics students and their team leader have performed exceptionally well during the International Mathematics Competition for University Students 2024 in Bulgaria in early August. This even made for a Dutch recor…
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Alex Tutwiler receives Archol grant to reveal hidden stories of child labor
PhD candidate Alex Tutwiler, from the Faculty of Archaeology, has received a grant from Archol, via the P.J.R. Modderman Foundation, to investigate how child labor shaped the bones of Dutch children between the 17th and 19th centuries. Using CT scans, she aims to build a more comprehensive picture of…
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Francesca Arici wants to raise maths awareness in society
Mathematician Francesca Arici has joined the Raising Public Awareness Committee of the European Mathematical Society. She aims to coordinate and unite the European efforts of communicating and promoting mathematics. ‘We also hope to achieve more recognition for people who do science communication.’
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Trees and Securitization: The Politics of Afforestation in Israel's Negev/Al Naqab | Research Seminar
Lecture, Research Seminar
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Central Values of L-Functions of Twisted Modular Forms of Composite Level
PhD defence
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Explaining a Probabilistic Prediction on the Simplex with Shapley Compositions
Lecture
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Solving Mathematical Challenges with Symbolic AI
Lecture
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Orientational Order and Confinement in Biological Tissues
PhD defence
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Course: Algorithms in Algebra
Course
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Veni grants for 22 researchers from Leiden University
An impressive 22 research projects by Leiden researchers have been awarded Veni funding from the Dutch Research Council (NWO).