Eileen, I merely parse what’s there to be parsed, and yet I see those charlatans at Collins opine that mathematics is ‘a group of related sciences, including algebra, geometry and calculus, concerned with the study of number’. For Chamberites it’s simply ‘the science of magnitude and number’.
It’s the latter MATH (who with a pseudonym like that ought to know) seems to have plumped for, otherwise the indefinite article causes problems.

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