# Should one place an “en dash” or an ordinary “hyphen” between AM and GM? [closed]

Should one place an "en dash" or an ordinary "hyphen" between AM and GM (arithmetic mean and geometric mean inequality)?

## closed as primarily opinion-based by Hans Lundmark, José Carlos Santos, Lord Shark the Unknown, Shailesh, The CountJul 4 at 2:33

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• This is a typographical question, not really mathematical. I would use a hyphen. – Ethan Bolker Jul 3 at 16:07
• AFAIK, one would for example write $\text{Birch--Swinnerton-Dyer conhecture}$ to make clear that there are two names, one being a double name. However, in your case I would see it as simple compounding, so $\text{AM-GM inequality}$ (similar to blue-white dress) – Hagen von Eitzen Jul 3 at 16:09
• If you're writing an article for a journal, they're likely to have their own editorial conventions, and enforce them, so perhaps the point is moot. – John Hughes Jul 3 at 16:14