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That’s a fun fact!
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From what I've seen in the comments, it's definitely ELO, if not through ubiquity alone. Happens to the best of 'em!
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Elo is nicer as it gives a nod to the inventor, no?
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Some say the greatest compliment a mathematician can be paid is when a concept that bears their name is so ubiquitous that we no longer capitalise it. (E.g. Abel with the abelian group).
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