I estimated the amount of graduate math students and especially the amount of math students in general from a theoretical point of view in an analogeous way like the Fermi-Problem.
- There are about $ 8\times10^9 $ people living right now.
- About $ \frac{1}{5} $ of the people are aged between 18 and 28, let's call them young adults.
- About $ \frac{1}{10} $ of young adults is studying.
- About $ \frac{1}{50} $ of students study math.
- About $ \frac{1}{5} $ of math students is studying at graduate level.
This gives $ 3.2\times10^6 $ people who study math and thus $ 640,000 $ graduate math students.
