: Re: Ordinal form of an unknown value In some science and engineering literature, it is common to right the ordinal form of an unknown number m as mth. While the ordinal form of number 1 is first,
(m-1)th is still appropriate. The expression in parentheses will still be read without the ordinal, so consider how it sounds when spoken—em-minus-oneth makes more sense than em-minus-onest.
I should also note that it's common to avoid the problem entirely through rephrasing (e.g. 'the value at index (m-1)'), but that may not be applicable to your field.
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