Greetings! As you need content not only on mathematics but also also graphical visualization of concepts then engineers would be the best choice for your project .
We are a corps of (Ph.D., MS) engineers, and have been working on Mathematics and Engineering Projects on international, and local marketplaces. So, beware of middlemen. We have full mastery of Modern Mathematics fields and their graphical interpretation. As you need not only mathematics but also also graphical visualization of concepts then engineers would be the best choice for your project .
We are 24/7 available on freelance-marketplace.
Waiting for your good response
Regards:
SHOAIB ABID