Abstract.
Almost hypercomplex pseudo-Hermitian manifolds are considered. Isotropic hyper-Kähler manifolds are introduced. A 4-parametric family of 4-dimensional manifolds of this type is constructed on a Lie group. This family is characterized geometrically. The condition a 4-manifold to be isotropic hyper-Kähler is given.
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Gribachev, K., Manev, M. Almost hypercomplex pseudo-Hermitian manifolds and a 4-dimensional Lie group with such structure. J. geom. 88, 41–52 (2008). https://doi.org/10.1007/s00022-007-1947-2
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DOI: https://doi.org/10.1007/s00022-007-1947-2