Math Journey

This is an invitation for collaboration from those who share a love for deep mathematical beauty! I’m developing "Math Journey" an app, which is designed for those of us who appreciate beauty of mathematics. Unlike existing apps, this will dive into a bit more advanced topics (like the Riemann Zeta function and so on) but will maintain level of popular mathematics. I’m looking for your suggestions on: -Which advanced topics are rarely covered in typical apps but deserve more attention? -Specific features you’d find exciting (e.g., interactive widgets, puzzle-based explorations, real-world case studies, etc.)? -Any learning approaches that you’ve always wanted to see in an app? My hope is to craft an experience that matches the curiosity of lifelong math learner. And in thanks for your help, I’m planning to offer promo codes so you can unlock paid content in the app once we add such functionality =)