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Vanilla 1.1.10 is a product of Lussumo. More Information: Documentation, Community Support.
added cross-pointer
A Riemannian manifold of dimension $4n$ is called a quaternion-Kähler manifold if its holonomy group is a subgroup of the direct product group $Sp(n) \times Sp(1)$.
There’s a lot more about this group on another page, so I added this:
This group is also called the compact symplectic group, since both it and the symplectic group are real forms of the a complex Lie group. See more at compact symplectic group.
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