On the rational cuspidal divisor class groups of Drinfeld modular curves X0(𝔭r)

Let Formula: see text be the rational cuspidal divisor class group of the Drinfeld modular curve Formula: see text for a prime power level Formula: see text. We relate the rational cuspidal divisors of degree 0 on Formula: see text with Formula: see text-quotients, where Formula: see text is the Drinfeld discriminant function. As a result, we are able to determine explicitly the structure of Formula: see text for arbitrary prime Formula: see text and Formula: see text.