English possessive in Mathematics As a non-native English speaker, I wonder what is the correct way to use the English possessive, also known as Saxon genitive, when dealing with mathematical objects. It seems to me that there is not an agreement about that, some examples: Taylor series Fourier series Fourier transform Laplace transform Euler function but also... Cantor's diagonal argument Euler's totient function Ramanujan's sum Kloosterman's sum D'Alembert's formula Regarding theorems I think the correct way is: "AUTHORNAME's theorem" "FIRSTAUTHORNAME-SECONDAUTHORNAME theorem" (no 's) Thank you in advance for any suggestion.

According to "Writing Mathematical Papers in English" by Jerzy Trzeciak the following are correct:

Minkowski's inequality

the Minkowski inequality.

For theorems he suggests the following two forms:

Fefferman and Stein's famous theorem

the famous Fefferman-Stein theorem.