E₈ manifold

In mathematics, the "E₈" manifold is the unique compact, simply connected topological 4-manifold with intersection form the "E"₈ lattice.

The "E₈" manifold was discovered by Michael Freedman in 1982. Rokhlin's theorem shows that it has no smooth structure (as does Donaldson's theorem), and in fact, combined with the work of Andrew Casson on the Casson invariant, this shows that the "E₈" manifold is not even triangulable as a simplicial complex.

The manifold can be constructed by first plumbing together disc bundles of Euler number 2 over the sphere, according to the Dynkin diagram for "E₈". This results in "P_E₈", a 4-manifold with boundary equal to the Poincare homology sphere. Freedman's theorem on fake 4-balls then says we can cap off this homology sphere with a fake 4-ball to obtain the "E₈" manifold.

ee also

*E₈ (mathematics)

References

* Alexandru Scorpan, "The Wild World of 4-manifolds", American Mathematical Society, ISBN 0-8218-3749-4

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