Carmichael function

(aka reduced totient function) (aka least universal exponent function) Here’s the link to the Wikipedia article on it. keywords: [Number Theory] [lambda function] [λ function] [ψ function] [psi function]

PUN (Dorian Gray)

Wikipedia says that linguist / anthropologist Nancy Dorian’s work “blurred the lines between linguistics and ethnology”. Presumably we can be forgiven for calling the blurring ‘Dorian gray’.