 Solution

ID: past-exam-of-the-mathematics-course-of-the-university-of-cambridge/2021/iii/paper-309/3/b/solution

The dual orthonormal coframe is

e^{0} = d t, e^{i} = t^{p_{i}} d x^{i},

because

e^{μ} (e_{ν}) = δ^{μ}_{ν}

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