Dear Aspiran

I hope you are doing good . As per your query , I would like to tell you that their are many phd streams in which you go for after persuing msc in mathematics. Some options are here in the following:-

1. Doctor ofPhilosophy in Mathematics

2. Doctor of Philosophy - Statistics

3. Doctor of philosophy-mathematical sciences

4. PHD in pure mathematics

Hope you found this answer helpful. Good luck for your future