hi as far as I can see, the error message asks to prove, that i > 0. You have constraint i+1 >= 0, so i can be ~1, which is not natural number, but quite from tutorial: ``` A termination metric is just a tuple of *natural* numbers and the standard lexicographic ordering on *natural* numbers is used to order such tuples. ``` and that is why you see ```C3TKtermet_isnat()```
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