This is the first part of the "New Kind of Paper" series that deals with concept of "handwritten calculator" – you scribble "1+2" and the system responds with "3". Think "Apple Math Notes", but 3 years before its debut. And with vectors, matrices, tensors, etc.
There are 5 parts so far:
1. https://mlajtos.mu/posts/new-kind-of-paper – overview of the concept
2. https://mlajtos.mu/posts/new-kind-of-paper-2 – intro to Fluent notation
3. https://mlajtos.mu/posts/new-kind-of-paper-3 – inspirational prior inventions
4. https://mlajtos.mu/posts/new-kind-of-paper-4 - how to think efficiently (including longer demo)
5. https://mlajtos.mu/posts/new-kind-of-paper-5 – review of Apple Math Notes and suggestions for improvements
Keyboard version of Fluent is available here: https://mlajtos.github.io/fluent/?code=RG9jdW1lbnRhdGlvbg