Maryam Mirzakhani, a Stanford College professor who’s the one lady to have gained the Fields Medal in arithmetic, has died. She was forty.

Stanford stated Mirzakhani died Saturday. She had breast most cancers. The varsity did not point out the place she died.

Mirzakhani was born in Iran and joined Stanford as a arithmetic professor in 2008.

Stanford stated her work concerned the geometric and dynamic complexities of curved surfaces similar to spheres and doughnut shapes.