In my text, many concepts are introduced (defined) by a sentence with 'called'. Examples are: This condition is called eigenvariable condition. This procedure is called the truth table method. A filter defined like that is called a trivial ultrafilter. Should 'called' be followed by an article? I have a feeling that 'called' makes a difference, and that in 'this formula is the interpolant of A and B' the article is fine. Is it so?

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    It's somewhat subjective, but I personally agree. If using called (and putting the thing in italics or quotation marks), I would tend to omit an article. Otherwise, I'd provide one. You are using words as words, outside of their normal syntax. (Boys is used here not boys are used here.) However, there is no "wrong" way of doing it—it's stylistic rather than about grammar. – Jason Bassford Oct 17 '18 at 14:28
  • Thank you indeed. I think you managed to verbalize what I and some other people felt or suggested. – Vitek Oct 17 '18 at 14:51

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