A few weeks ago, we posted on a klutzy index law elaboration in the new curriculum:
using examples such as 
, and 
to illustrate the necessity that for any non-zero natural number 𝑛, 
(new AC9M8N02)
Some commenters were understandably puzzled by a side point: ACARA’s employment of the expression “non-zero natural number”. In this post, we’ll dispel any lingering lack of puzzlement.