# Maryam Mirzakhani

Maryam Mirzakhani
مریم میرزاخانی
Mirzakhani at the 2014 International Congress of Mathematicians in Seoul, where she received the Fields Medal.
Born12 May 1977[1]
22 Ordibehesht 1356[2]
Tehran, Iran
Died14 July 2017 (aged 40)
EducationSharif University of Technology (BSc)
Harvard University (PhD)
Spouse
(m. 2008)
Children1
Awards
Scientific career
FieldsMathematics
Institutions
ThesisSimple geodesics on hyperbolic surfaces and the volume of the moduli space of curves (2004)

Maryam Mirzakhani (Persian: مریم میرزاخانی, pronounced [mæɾˈjæm miːɾzɑːxɑːˈniː]; 12 May 1977 – 14 July 2017) was an Iranian[5][2] mathematician and a professor of mathematics at Stanford University.[6][7] Her research topics included Teichmüller theory, hyperbolic geometry, ergodic theory, and symplectic geometry.[5] In 2005, as a result of her research, she was honored in Popular Science's fourth annual "Brilliant 10" in which she was acknowledged as one of the top 10 young minds who have pushed their fields in innovative directions.[8]

On 13 August 2014, Mirzakhani was honored with the Fields Medal, the most prestigious award in mathematics,[9][10] becoming the first Iranian to be honored with the award[11] and the first of only two women to date. The award committee cited her work in "the dynamics and geometry of Riemann surfaces and their moduli spaces".[12]

On 14 July 2017, Mirzakhani died of breast cancer at the age of 40.[13]

## Early life and education

Mirzakhani was born on 12 May 1977[14][1] in Tehran, Iran.[15] As a child, she attended Tehran Farzanegan School, part of the National Organization for Development of Exceptional Talents (NODET). In her junior and senior years of high school, she won the gold medal for mathematics in the Iranian National Olympiad, thus allowing her to bypass the national college entrance exam.[16] In 1994, Mirzakhani became the first Iranian woman to win a gold medal at the International Mathematical Olympiad in Hong Kong, scoring 41 out of 42 points.[17] The following year, in Toronto, she became the first Iranian to achieve the full score and to win two gold medals in the International Mathematical Olympiad.[18][19] Later in her life, she collaborated with friend, colleague, and Olympiad silver medalist, Roya Beheshti Zavareh (Persian: رؤیا بهشتی زواره), on their book 'Elementary Number Theory, Challenging Problems', (in Persian) which was published in 1999.[16] Mirzakhani and Zavareh together were the first women to compete in the Iranian National Mathematical Olympiad and won gold and silver medals in 1995, respectively.

On 17 March 1998, after attending a conference consisting of gifted individuals and former Olympiad competitors, Mirzakhani and Zavareh, along with other attendees, boarded a bus in Ahvaz en route to Tehran. The bus was involved in an accident wherein it fell off a cliff, killing seven of the passengers—all Sharif University students. This incident is widely considered a national tragedy in Iran. Mirzakhani and Zavareh were two of the few survivors.[20]

In 1999, she obtained a Bachelor of Science in mathematics from the Sharif University of Technology. During her time there, she received recognition from the American Mathematical Society for her work in developing a simple proof of the theorem of Schur.[21] She then went to the United States for graduate work, earning a PhD in 2004 from Harvard University, where she worked under the supervision of the Fields Medalist, Curtis T. McMullen.[22] At Harvard, she is said to have been "distinguished by determination and relentless questioning". She used to take her class notes in her native language Persian.[23][24]

## Career

Mirzakhani was a 2004 research fellow of the Clay Mathematics Institute and a professor at Princeton University.[25] In 2009, she became a professor at Stanford University.[12][26]

### Research work

Maryam Mirzakhani, August 2014

Mirzakhani made several contributions to the theory of moduli spaces of Riemann surfaces. Mirzakhani's early work solved the problem of counting simple closed geodesics on hyperbolic Riemann surfaces by finding a relationship to volume calculations on moduli space. Geodesics are the natural generalization of the idea of a "straight line" to "curved spaces". Slightly more formally, a curve is a geodesic if no slight deformation can make it shorter. Closed geodesics are geodesics which are also closed curves—that is, they are curves that close up into loops. A closed geodesic is simple if it does not cross itself.[27]

A previous result, known as the "prime number theorem for geodesics", established that the number of closed geodesics of length less than ${\displaystyle L}$ grows exponentially with ${\displaystyle L}$ – it is asymptotic to ${\displaystyle e^{L}/L}$. However, the analogous counting problem for simple closed geodesics remained open, despite being "the key object to unlocking the structure and geometry of the whole surface," according to University of Chicago topologist Benson Farb.[28] Mirzakhani's 2004 PhD thesis solved this problem, showing that the number of simple closed geodesics of length less than ${\displaystyle L}$ is polynomial in ${\displaystyle L}$. Explicitly, it is asymptotic to ${\displaystyle cL^{6g-6}}$, where ${\displaystyle g}$ is the genus (roughly, the number of "holes") and ${\displaystyle c}$ is a constant depending on the hyperbolic structure. This result can be seen as a generalization of the theorem of the three geodesics for spherical surfaces.[29][30]

Mirzakhani solved this counting problem by relating it to the problem of computing volumes in moduli space—a space whose points correspond to different complex structures on a surface genus ${\displaystyle g}$. In her thesis, Mirzakhani found a volume formula for the moduli space of bordered Riemann surfaces of genus ${\displaystyle g}$ with ${\displaystyle n}$ geodesic boundary components. From this formula followed the counting for simple closed geodesics mentioned above, as well as a number of other results. This led her to obtain a new proof for the formula discovered by Edward Witten and Maxim Kontsevich on the intersection numbers of tautological classes on moduli space.[6][31]

Her subsequent work focused on Teichmüller dynamics of moduli space. In particular, she was able to prove the long-standing conjecture that William Thurston's earthquake flow on Teichmüller space is ergodic.[32] One can construct a simple earthquake map by cutting a surface along a finite number of disjoint simple closed geodesics, sliding the edges of each of these cut past each other by some amount, and closing the surface back up. One can imagine the surface being cut by strike-slip faults. An earthquake is a sort of limit of simple earthquakes, where one has an infinite number of geodesics, and instead of attaching a positive real number to each geodesic, one puts a measure on them.

In 2014, with Alex Eskin and with input from Amir Mohammadi, Mirzakhani proved that complex geodesics and their closures in moduli space are surprisingly regular, rather than irregular or fractal.[33][34] The closures of complex geodesics are algebraic objects defined in terms of polynomials and therefore, they have certain rigidity properties, which is analogous to a celebrated result that Marina Ratner arrived at during the 1990s.[34] The International Mathematical Union said in its press release that "It is astounding to find that the rigidity in homogeneous spaces has an echo in the inhomogeneous world of moduli space."[34]

### Awarding of Fields Medal

Four Fields medallists left to right Artur Avila, Martin Hairer (at back), Maryam Mirzakhani (with her daughter) and Manjul Bhargava at the ICM 2014 in Seoul

Mirzakhani was awarded the Fields Medal in 2014 for "her outstanding contributions to the dynamics and geometry of Riemann surfaces and their moduli spaces".[35] The award was made in Seoul at the International Congress of Mathematicians on 13 August.[36] At the time of the award, Jordan Ellenberg explained her research to a popular audience:

[Her] work expertly blends dynamics with geometry. Among other things, she studies billiards. But now, in a move very characteristic of modern mathematics, it gets kind of meta: She considers not just one billiard table, but the universe of all possible billiard tables. And the kind of dynamics she studies doesn't directly concern the motion of the billiards on the table, but instead a transformation of the billiard table itself, which is changing its shape in a rule-governed way; if you like, the table itself moves like a strange planet around the universe of all possible tables ... This isn't the kind of thing you do to win at pool, but it's the kind of thing you do to win a Fields Medal. And it's what you need to do in order to expose the dynamics at the heart of geometry; for there's no question that they're there.[37]

In 2014, President Hassan Rouhani of Iran congratulated her for winning the topmost world mathematics prize.[38]

Mirzakhani has an Erdős number of 3.[39]

## Personal life

In 2008, Mirzakhani married Jan Vondrák, a Czech theoretical computer scientist and applied mathematician who currently is a professor at Stanford University.[40][41] They had a daughter.[42] Mirzakhani lived in Palo Alto, California.[43]

Mirzakhani described herself as a "slow" mathematician, saying that "you have to spend some energy and effort to see the beauty of math." To solve problems, Mirzakhani would draw doodles on sheets of paper and write mathematical formulas around the drawings. Her daughter described her mother's work as "painting".[23][44]

She declared:

I don't have any particular recipe [for developing new proofs] ... It is like being lost in a jungle and trying to use all the knowledge that you can gather to come up with some new tricks, and with some luck, you might find a way out.[23]

## Death and legacy

Mirzakhani was diagnosed with breast cancer in 2013.[23] In 2016, the cancer spread to her bones and liver,[23][45] and she died on 14 July 2017 at the age of 40 at Stanford Hospital in Stanford, California.[23][46]

Iranian president Hassan Rouhani and other officials offered their condolences and praised Mirzakhani's scientific achievements. Rouhani said in his message that "the unprecedented brilliance of this creative scientist and modest human being, who made Iran's name resonate in the world's scientific forums, was a turning point in showing the great will of Iranian women and young people on the path towards reaching the peaks of glory and in various international arenas."[23]

Upon her death, several Iranian newspapers, along with Iranian President Hassan Rouhani, broke taboo and published photographs of Mirzakhani with her hair uncovered. Although most newspapers used photographs with a dark background, manipulation by photoshop, and even paintings to "hide" her hair,[11][47] this gesture was widely noted in the western press and on social media.[48][49] Mirzakhani's death has also renewed debates within Iran regarding matrilineal citizenship for children of mixed-nationality parentage; Fars News Agency reported that, on the heels of Mirzakhani's death, 60 Iranian MPs urged the speeding up of an amendment to a law that would allow children of Iranian mothers married to foreigners to be given Iranian nationality, in order to make it easier for Mirzakhani's daughter to visit Iran.[11][48]

Plaque for Mirzakhani Hall in Isfahan

Numerous obituaries and tributes were published in the days following Maryam Mirzakhani's death.[50][51] As a result of advocacy carried out by the Women's Committee within the Iranian Mathematical Society (Persian: کمیته بانوان انجمن ریاضی ایران), the International Council for Science agreed to declare Maryam Mirzakhani's birthday, 12 May, as International Women in Mathematics Day in respect of her memory.[52][53]

Various establishments have also taken after Mirzakhani's namesake in honor of her life and achievements. In 2017, Farzanegan High school – the high school Mirzakhani formerly attended – named their amphitheater and library after her. Additionally, Sharif University of Technology, the institute wherein Mirzakhani obtained her bachelors, has since named their main library in the College of Mathematics after her. Further, the House of Mathematics in Isfahan, in collaboration with the Mayor, named a conference hall in the city after her.[54]

In 2014, students at the University of Oxford founded the Mirzakhani Society, a society for women and non-binary students studying Mathematics at the University of Oxford. Mirzakhani met the society in September 2015, when she visited Oxford.[55]

In 2016, Maryam Mirzakhani was made a member of the National Academy of Sciences (of the United States), making her the first Iranian woman to be officially accepted as a member of the academy.[56]

On 2 February 2018, Satellogic, a high-resolution Earth observation imaging and analytics company, launched a ÑuSat type micro-satellite named in honor of Maryam Mirzakhani.[57]

On 4 November 2019, The Breakthrough Prize Foundation announced that the Maryam Mirzakhani New Frontiers Prize has been created to be awarded to outstanding women in the field of mathematics each year. The \$50,000 award will be presented to early-career mathematicians who have completed their PhDs within the past two years.[58][59]

In February 2020, on International Day of Women and Girls in STEM, Mirzakhani was honoured by UN Women as one of seven female scientists dead or alive who have shaped the world.[60]

In 2020, George Csicsery featured her in the documentary film Secrets of the Surface: The Mathematical Vision of Maryam Mirzakhani.[61][62]

The May 12 Initiative was created in Mirzakhani's honor[14] to celebrate women in mathematics. The Initiative is coordinated by the European Women in Mathematics, Association for Women in Mathematics, African Women in Mathematics Association, Colectivo de Mujeres Matemáticas de Chile, and the Women's Committee of the Iranian Mathematical Society. In 2020, 152 events were held.[63]

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