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: This would be good, although I'm not sure much is known. Do you know a reference? [[User:Eric Rowland|Eric Rowland]] ([[User talk:Eric Rowland|talk]]) 17:42, 26 November 2021 (UTC)
:: I think it is well-known at least for integers, rational, algebraic, and real numbers. I will do some digging for a reference sometime. (A few other additions to the articles need good references too, mainly the closure properties.)
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