I really envy the landlord for studying mathematics, which is easier to change careers than other majors. I have to use a lot of math now, which gives me a headache. If you are employed, the mechanical aspect will definitely be better. The professional name of engineering mechanics is too professional for many enterprises to understand. If the landlord is interested, he can also consider civil engineering, even economics and finance. As far as I know, there is a shortage of talents who can apply mathematics to their majors.