On the concrete surface with `b = 0`, if `f` reduces to a function of positive finite contact `c` with the special fiber axis, then `O[f]` is free of rank `a * c` over `O`.

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On the concrete surface with `b = 0`, if `f` reduces to a function of positive finite contact `c` with the special fiber axis, then `O[f]` is free of rank `a * c` over `O`. · Prove2Me