From my reading, the X between SU(4)XSU(2) mean Cartesian product.(adsbygoogle = window.adsbygoogle || []).push({});

But How the way to mutiply two matrix A in SU(4) and B in SU(2).

Example the matrix

A=\begin{pmatrix} a & b &

c & d \\ e& f &

g & h \\ i & j &

k & l \\ m & n&

o & p \end{pmatrix}

and

B=\begin{pmatrix} 1 &2 \\

3 &4 \end{pmatrix}

Please show me the way to multiply SU(4)XSU(2) to form 8X8 matrix.

Thank you

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# A Meaning of X in SU(2)XSU(2)

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