March 14th was solemnly celebrated as Pi Day by math-enthusiasts around the world before the International Day of Mathematics came into being. The well-known circle constant Pi, which specifies the ratio of the circumference of a circle to its diameter, has an infinite amount of digits but is commonly known as 3.14. In some countries, March 14th is written as 3/14 (so almost 3.14). For math-enthusiasts, this was enough of a reason to celebrate and for the **International Mathematical Union**, it was reason enough to pick up the date and declare this day the annual International Day of Mathematics.

In Ancient Egypt mathematicians already knew that Pi was the ratio of the circumference of a circle to its diameter. At first, however, the quantification of Pi was not very precise. Determining the digits by hand using geometric or numerical methods was and still is a great challenge, and errors kept happening throughout history. It took several hundred years to determine the first 707 digits, only to find out about 70 years later that not all 707 digits were correct.

The big breakthrough in determining Pi came with the help of computers in the second half of the 20th century. The number of known digits rose rapidly from a few hundred to a few trillion in the early 21st century. Of course, there is still no end in sight.

The fact that we use the Greek letter π today is largely due to the Basel mathematician Leonhard Euler. The first documented use of π is not attributable to him, but it was Euler who popularized its use.

In addition to Pi's undisputed place in mathematical research, more and more curiosities, entertaining facts, and applications spawned over the years. For example, it is possible to find any date of birth in the tangle of Pi's digits. Leonhard Euler's birthday, for example, is at position 20.625 in Pi's digits (4/15/1707 π = 3.141592…6335 [4 15 07]46088...). If you want to determine your own Pi day, you can either search the infinite digits of Pi by yourself or use one of the many Pi birthday calculators available on the internet.

In the course of the International Day of Mathematics, various institutions hold exciting events and lectures every year. **Here **you can find an overview of some events.

Further information can also be found on the website of the **International Mathematical Union** and the **Pi Day website**.

Please find the program of the Department of Mathematics and Computer Science below:

**17:00-17:45** Presentation (https://unibas.zoom.us/j/95298357874?pwd=V1o1RzlLdFd2a0oxLzBEY1piSmhJUT09)

**18:00-18:45** Open consultation (https://unibas.zoom.us/j/95298357874?pwd=V1o1RzlLdFd2a0oxLzBEY1piSmhJUT09)

**19:00-19:45** Open consultation (https://unibas.zoom.us/j/95298357874?pwd=V1o1RzlLdFd2a0oxLzBEY1piSmhJUT09)

**Here** you will find a short presentation of the Master’s degree in Computer Science.

**17:00-18:00** Open consultation (https://unibas.zoom.us/j/98957600025?pwd=V05LZjlUb1VJQ1NMRSt6aXV0N2VYUT09)

**18:00-18:45** Presentation (https://unibas.zoom.us/j/98957600025?pwd=V05LZjlUb1VJQ1NMRSt6aXV0N2VYUT09)

**18:45-20:00** Open consultation (https://unibas.zoom.us/j/98957600025?pwd=V05LZjlUb1VJQ1NMRSt6aXV0N2VYUT09)

**Here** you will find a short presentation of the Master’s degree in Mathematics.

**17:00-17:45** Presentation, open consultation (I) (https://unibas.zoom.us/j/98135667870)

**18:00-18:45** Meet our Students (https://unibas.zoom.us/j/94100921756)

**19:00-19:45** Presentation, open consultation (II) (https://unibas.zoom.us/j/98135667870)

**Here** you will find a short presentation of the Master’s degree in Actuarial Science.

**Here** you will find a pre-recorded Actuarial Science lecture.

On the website of the Basel Master’s Info Evening, you can get an overview of the entire program of the Info Evening and have a look at various information material, such as sample lectures and handouts.

]]>The swissbib Basel Bern (and swissbib.ch) library catalogues that are currently in use will be discontinued and replaced at a national level by the new discovery portal called swisscovery. Services, loan periods and fees will be standardised across Switzerland. A Swiss courier and document delivery service will supplement the Basel courier.

For data protection reasons, existing users will need to re-register for the switch to the new system. This will be possible from the end of September 2020.

During a few days before the system change, it will not be possible to borrow items. The temporary loan freeze is expected to take place at the end of November 2020. We will inform you of the exact date in good time.

]]>Bonicatto has been working in a postdoctoral position at the Department of Mathematics and Computer Science at the University of Basel since 2017. Previously, he worked at the Scuola Internazionale Superiore di Studi Avanzati (SISSA), where he wrote his dissertation under the supervision of Prof. Stefano Bianchini.

In addition to receiving the INdAM-UMI-SIMAI Award, the most important research results of the dissertation were published in the renowned mathematical journal Inventiones mathematicae.

]]>There are no fees, but registration is necessary. Registered users will receive an email a few hours before the talk with a link to the Zoom meeting.

]]>In 2014 Maryam Mirzakhani was the first and only woman ever to receive a **Fields Medal**, the highest award in mathematics, for «outstanding contributions to the geometry and dynamics of Riemann surfaces and their modular spaces». In her honour, **The National Academy of Sciences Award in Mathematics**, was renamed **The Maryam Mirzakhani Prize in Mathematics** just a few years later.

However, she is not the first and not the only female mathematician who has achieved outstanding performance. Anyone looking for women in mathematics begins a journey through history from late Greek antiquity right to the moon - from Hypatia to Margaret Hamilton - and finds impressive biographies and brilliant research.

May 12th is not only Mirzakhani's birthday but a day to celebrate all women in mathematics and be inspired by them.

]]>Until the closing on Friday, March 20th, those whose UNIcard has access rights to the building will continue to have access to the department.

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The Collatz conjecture is one of these unsolved problems in mathematics. Let's think of any natural number. If it is even, divide it by two. If it is odd, multiply it by three and add one. Apply the same rules to your results over and over again. The Collatz conjecture predicts that at some point we reach the number one and are then caught in an endless loop (1, 4, 2, 1, 4, 2, 1, ...). Although these rules have been applied to more than a trillion numbers without finding an exception, no mathematical proof or general mathematical argument can be derived from the Collatz conjecture. Among the most recent challengers of the problem is Terence Tao. He recognized a connection between the Collatz conjecture and partial differential equations: The attempt to predict the future nature of a system and to check how and whether a pattern depends on the respective starting point. Although he did not expect to make great progress and did not solve the Collatz conjecture, he was still able to make the most significant progress in recent decades.

Last week Tao was a guest at the Department of Mathematics and Computer Science at the University of Basel and gave a lecture on his work on the Collatz conjecture. More than 500 national and international guests, including around 180 high school students, streamed into the auditorium hours before the event began. Because of the large number of guests, the lecture was also broadcasted in an adjoining lecture hall. During his lecture, Terence Tao mastered the feat of presenting advanced level mathematics in a way that is accessible to everyone. He managed to inspire and make the audience laugh so much that he was even asked for autographs and selfies after his lecture.

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She obtained her PhD in Mathematics in 2012 at the University of Rome (La Sapienza) and did postdoctoral research at the Institute of Mathematics at the University of Zurich and at the Hausdorff Center for Mathematics at the University of Bonn. She has been an Ambizione Fellow of the SNF at the University of Zurich since 2016. Her project at the Department of Mathematics and Computer Sciences addresses questions in kinetic theory and many-body interactions in both classical and quantum systems evolving around the theory of the Boltzmann equation.

]]>Tags: TAG News Forschung Mathematik]]>

Applicants are requested to submit their documents as specified in the job advertisements (Postdoc / PhD).

]]>Giusi Moffa received her PhD in statistics from the University of Bristol in 2010 and then performed postdoctoral research in statistical bioinformatics at the Institute for Functional Genomics at the University of Regensburg. From 2014 to 2017, she was a senior statistician in clinical pharmacology for oncology at Novartis Pharma in Basel before joining the Basel Institute for Clinical Epidemiology and Biostatistics (CEB). Early 2019, Giusi Moffa was a visiting scientist in the research group of Miguel Hernán at the Harvard School of Public Health. Since 2015, she has also been an honorary research associate in the Division of Psychiatry at University College London.

Giusi Moffa`s application-oriented and interdisciplinary work involves developing methods for clinical research, epidemiology and cancer genomics. Her methodological research revolves around causal inference and probabilistic graphical models for high dimensional data, with a particular emphasis on computational methods for Bayesian statistics.

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