Mathematician and Elise Richter fellow Sandra Müller of Vienna University of Technology is analysing various forms of infinity stemming from set theory. She is trying to more closely link the theory of large cardinal numbers and the determinacy axiom—two theoretical approaches which at first sight do not have much in common. In her START project, she is attempting to expand the theoretical basis upon which mathematics is built. Sandra Müller received her doctoral degree in mathematics from the University of Münster in 2016. Until 2021, she was a postdoc, assistant professor, and L’Oréal Austria Fellow at the University of Vienna. Since 2021, the researcher from Germany has been working at Vienna University of Technology as part of the Elise Richter career programme.