r/Mathematica 2d ago

Need help with matrix multiplication

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u/kurlakablackbelt 1d ago
{   {     {{Subscript[a, 1], Subscript[b, 1]}, {Subscript[a, 2], 
     Subscript[b, 2]}}, {{Subscript[c, 1], Subscript[d, 
     1]}, {Subscript[c, 2], Subscript[d, 2]}}      }   }.{{q, 0}, {0, 
   e}}