Trace of the on-line part: $\operatorname{tr}\bigl(\sum m_z u_z u_z^{\mathsf T}\bigr) = \sum m_z \|u_z\|^2$

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Trace of the on-line part: $\operatorname{tr}\bigl(\sum m_z u_z u_z^{\mathsf T}\bigr) = \sum m_z \|u_z\|^2$ · Prove2Me