Much better intro article about tree calculus here, vs the actual site: https://olydis.medium.com/a-visual-introduction-to-tree-calc...
I feel like neither of these just give actual formal definitions, which would be much clearer.
Another resource I found in HN discussions: https://latypoff.com/tree-calculus-visualized/
I feel like neither of these just give actual formal definitions, which would be much clearer.