Why is the "Poincare conjecture in 3 dimensions" so hard?

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Is it related to triple integrals and the fact that three is the smallest dimension in which Rn arises as a special case of the Barnett construction.

The underlying metric signature on the generating Barnett space of R3 varies non-smoothly between permutations of bases.

If you take the permutation group of the 3 bases, there is a homomorphism between that group and the cyclic group C3, meaning that integrals over spaces with 3 basis vectors are not symmetric.

If you take a cochain complex generated by infinitesimal volume elements, and you try to access homology groups, they are all trivial except for the first group in the sequence, which is not Z like you would expect, but is actually SO(3).

Furthermore, you can form three categories, each containing modules generated by infinitesimal elements of a space, and you can prove that if there is a functor between two of the categories, that there is no functor connecting the third one. this proves that many triple integrals are literally impossible to solve.