ABSTRACT. We consider the polynomial ring 𝑆 := 𝐾[𝑋₀,...,𝑋𝑛] over a field 𝐾 and the rings 𝑅𝑖 := 𝐾[(𝑋₀/𝑋𝑖),...,(𝑋𝑛/𝑋i ...