Hello, I am a college student majoring in mathematics. If you don't have a master's degree in mathematics, you can't graduate with a doctorate in mathematics. Mathematics major has great particularity and needs a huge knowledge system as the foundation.

Even those who switch from undergraduate to major, such as some people who pass the examination and interview at the end of their freshman year and switch from other majors to mathematics majors, will generally have to spend a year in prison before they can re-study in the school of mathematics from their freshman year unless they have completed all the mathematics courses in their freshman year and passed the credits.

So what's more, both undergraduate and master majors have no mathematical foundation. This is unlikely.

I hope it will help you, and I hope it will be adopted ~ Welcome to ask questions ~