@Tes yeux noirs,
yet, in tech speak, be it UK or Merkin, we all talk of "math proofs" (whenever its used as an adjective).
One of your countrymen tried to argue that you deny the collective nature of the word "math" and insist on a plural form as a contraction from mathematics. Doesnt mean either yours or ours is "more" correct.
Like kebab or kebob. Its linguistic micro evolution.