Of course, the hero of this piece is not Adam Riese at all, but Hans-Herbert Kurz. But since he is a math teacher at a high school and nicknames have always been a sign of special interest among students in their teachers, he is called Adam Riese. And as far as miscalculation is concerned, it would have been almost embarrassing for good Adam if the class hadn't discovered his mistake in good time and had done something together with the parents to suggest another solution.