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Let M be a 2xx2 symmetric matrix with in...

Let `M` be a `2xx2` symmetric matrix with integer entries. Then `M` is invertible if The first column of `M` is the transpose of the second row of `M` The second row of `M` is the transpose of the first column of `M` `M` is a diagonal matrix with non-zero entries in the main diagonal The product of entries in the main diagonal of `M` is not the square of an integer

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