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→Symmetric part of a tensor: being clear about brackets |
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:<math>T_{(i_1i_2\cdots i_k)} = \frac{1}{k!}\sum_{\sigma\in \mathfrak{S}_k} T_{i_{\sigma 1}i_{\sigma 2}\cdots i_{\sigma k}}</math>
with parentheses () around the indices
==Symmetric product==
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