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A simple workaround is to re-build the graph object by cycling it through some other representation. Here are two possible solutions: rebuildGraph[g_] := Uncompress@Compress[g] (* solution 1 *) rebuildGraph[g_] := Graph[VertexList[g], EdgeList[g]] (* solution 2 destroys properties but it's fine for isomorphism testing purposes *) isomorphicGraphQ[g1_, ...


Now fixed in version 10.2. In[1]:= m = {{0, 1}, {-1, 0}}; In[2]:= {AntihermitianMatrixQ[m], HermitianMatrixQ[m], AntihermitianMatrixQ[m]} Out[2]= {True, False, True} As per the comments, yes, there is information stored in the internal representation of matrices (for example, a symmetry flag) and no, it is not accessible from top level code.


What you are encountering is something all Mathematica users encounter because it is the way Mathematica works. Szabolcs has explained this well. However, I would like to add that you can fix the "problem" by using Simplify Simplify[(2*I*k)^(1 + 0.1*I) (2*I*k)^(I*m) == (2*I*k)^(1 + 0.1*I + I*m)] True Simplify[(I k)^(N[Pi]) (I k)^(I m) == (I k)^(N[Pi] ...


This is not a bug. It's a misunderstanding about what TrueQ does. From the documentation, TrueQ will return True only if the input is explicitly True To put it more explicitly, it's equivalent to trueQ[expr_] := If[expr === True, True, False]. The expression (2*I*k)^(1 + 0.1*I) (2 I k)^(I*m) == (2*I*k)^(1 + 0.1*I + I*m) is not the symbol True ...

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