What is the trace of a second rank tensor covariant in both indices?(adsbygoogle = window.adsbygoogle || []).push({});

For a tensor covariant in one index and contravariant in another ##T^i_j##, the trace is ##T^k_k## but what is the trace for ##T_{ij}## because ##T_{kk}## is not even a tensor?

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# What is the trace of a second rank covariant tensor?

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