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Questions on the manipulation of matrices in Mathematica.

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2 answers
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Selecting matrices based on existence of unique column and row of all equal terms

So, I have a list of lists of lists such as the following: {{{4}}, {{7, 7}, {7, 7}}, {{5, 5}, {6, 6}}, {{2, 1}, {1, 1}}} Interpreting the elements of this list as $n\times n$ matrices, I want to it …
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