So there are some interesting symmetric rank 0 tensors, for example the Kronecker delta ..... But my question is more simple than that..... Is a number like 1 , 5, e , etc considered symmetric? I would say yes, but I was recently told no in my physics class
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Scalars do not have the property of symmetry. However, a 1 dimensional 2nd rank tensor, or equivalently, it's representation as a 1x1 matrix $[x]$ is symmetric.
A complex 1x1 matrix $[x]$ where x is real is Hermitian.