p.4, footnote [20] — $(A\otimes B\,\varrho\,C\otimes D)^{T_B}=A\otimes D^T\,\varrho^{T_B}\,C\otimes B^T$

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p.4, footnote [20] — $(A\otimes B\,\varrho\,C\otimes D)^{T_B}=A\otimes D^T\,\varrho^{T_B}\,C\otimes B^T$ · Prove2Me