Talk:Representation theorem
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This seems too restrictive[edit]
What about the Kolmogorov–Arnold representation theorem? I don't think we can see it in terms of isomorphism. What about the representation theorems in logic that show semantic equivalence? These send structures with one signature into structures with a different signature. So, we cannot have any isomorphism in these cases. I suspect that there are plenty of other examples of representation theorems that do not and cannot use the notion of isomorphism, which is very strong. --Dominic Mayers (talk) 19:59, 23 December 2018 (UTC)