Posted per FL's request
Norm

-------- Forwarded Message --------
Subject: Dijkstra's argument
Date: Sun, 26 Apr 2020 17:31:09 +0200 (CEST)
From: fl
To: Megill Norman

 Hi Norm,

can you post this.

Dijkstra's argument doesn't seem to apply to our problem. He is dealing 
with finding a good convention to speak of a sequence of natural numbers 
using <= or <. It is not at all our problem. We don't use order relations 
to speak of  a word.  He   also says  he prefers 0 because when you use the 
convention 0 <= x < N the bound  is N not  N +1. Once again it is not our 
problem: we don't use order relations. Our unique problem is what is better 
when we concatenate two words. And do we prefer our proofs are cluttered 
with expressions N - 1 or with the simpler N?

-- 
FL

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