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3.2.3 Names of Indeterminates
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***** NOT YET UPDATED TO CoCoA-5: follow with care *****
Each indeterminate of a polynomial ring may have one of the following
forms:
* a single lower case letter;
* a single lower case letter, indexed by one or more integer
expressions, separated by commas, and enclosed by square
brackets, e.g. x[1,3+5,2].