 Solution

ID: past-exam-of-the-mathematics-course-of-the-university-of-cambridge/2021/iii/paper-302/2/i/solution

The identity and inverse axioms give

φ^{r} (x, 0) = x^{r}, φ^{r} (0, x) = x^{r}, φ^{r} (\overset{x}{ˉ}, x) = 0 .

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