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I have the following code in Mathematica:

but it does not evaluate the determinant as a number, how to force it to do that?Code (Text):G[k_, l_] :=

MatrixForm[Table[If[i == j, 1, 0], {i, 1, 3}, {j, 1, 3}]];

Print[\!\(

\*UnderoverscriptBox[\(\[Sum]\), \(k = 1\), \(3\)]\(

\*UnderoverscriptBox[\(\[Sum]\), \(l = 1\), \(3\)]Det[G[k, l]]\)\)];

Thanks in advance

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# Det in Mathematica

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