Comments by "EebstertheGreat" (@EebstertheGreat) on "AI Can Do Maths Now, and it's Wild" video.
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I think the British pronunciation of "upsilon" and "epsilon" highlights the etymology of the names. Long ago, the Greeks forgot the names for ε, υ, ο, ω, and some other letters. So they just called them by their sound, the way we do vowels in English, like we just call E "ee." But as some of these vowels started to sound like each other, they added words to the names to distinguish them, like "little o" for omicron and "big o" for omega, similar to the way some Spanish-speakers call b and v "be larga" and "ve corta" or similar. In the case of ε and υ, "psilon" meant "bare," on its own, so an epsilon is a bare e. This distinguished it from αι, which had the same sound. Similarly, upsilon is a bare u, as opposed to ου.
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