Hi there,
Welcome to the forum! Yes, this forum is a great place to seek assistance with the mathematics of quantum theory and string theory. Many members here have a strong background in math and are familiar with these concepts.
To enter formula characters in your messages, there are a few options. You can use LaTeX, which is a typesetting language commonly used for mathematical equations. There are many online LaTeX editors that you can use to create your equations and then copy and paste them into your message.
Another option is to use the built-in equation editor in the forum's text editor. Simply click on the "Equation" button and a pop-up window will appear where you can input your equation using the available symbols and functions.
I hope this helps! Don't hesitate to ask for assistance if you encounter any difficulties. We're all here to help each other out. Good luck with your studies!