exotic four-space

exotic four-space

[ig¦zäd·ik ′fȯr‚spās]
(mathematics)
A four-dimensional manifold that is homeomorphic, but not diffeomorphic, to four-dimensional Euclidean space.
References in periodicals archive ?
"We know these exotic four-spaces exist, but we don't know how to construct them explicitly," Kirby says.