# Exercise Sheet 13, Task 9

I think there is a mistake in the OCaml function and the mathematical definition in Task 9 of Exercise Sheet 13. The result for x < y should be (0, x) as 1\cdot y + x = x holds for y = 0 but the specification enforces y > 0. The C0 program, on the other hand, is correct.

Thank you. We will fix it.

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