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I am having trouble understanding why T^{ij}can be non-zero for i≠j. T^{ij}is the flux of the i-th component of momentum across a surface of constant x^{j}. Isn't the i-th component of momentumtangentto the surface of constant x^{j}and therefore its flux across that surface zero? What am I missing here?

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# Why shear stress components of the Stress Energy tensor not zero?

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