There are two “facets” to the numbering system of Tractatus Logico-Philosophicus. One is to show the logical importance the comments to propositions/comments. The other is to show to which of the propositions/comments are they a comment of.
Two “problems” immediately come to mind when I look at the system:
- In certain parts the less important comments come first before the more important ones.
- There can never be more than ten comments to a comment.