Because it's very much a language if you want to formally communicate your thoughts. The 'syntax' becomes flexible when you're into higher levels of math. Feynm

Because it's very much a language if you want to formally communicate your thoughts. The 'syntax' becomes flexible when you're into higher levels of math. Feynman inventing Feynman diagrams comes to mind. This was one way math became more intuitive and flexible for communication of novel thoughts.