[r-t] Delta-based transposition representation

[Glenn Taylor]

---Alan wrote:
A while ago I wrote some code to expand place notation to the 
corresponding blue line numbers.   Etc.
---

Alan,

I don't know what you mean by "blue line numbers". Is this somehow related
to Seagar's Blue Line Proof process, or is it to do with converting rows to
their index numbers for proof purposes? Or neither?

Regards,

Glenn