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math.DG2018
Submaximally Symmetric Quaternion Hermitian Structures
Boris Kruglikov, Henrik Winther
We consider and resolve the gap problem for almost quaternion-Hermitian structures, i.e. we determine the maximal and submaximal symmetry dimensions, both for Lie algebras and Lie…
math.DG2018
C-projective symmetries of submanifolds in quaternionic geometry
Aleksandra Borówka, Henrik Winther
The generalized Feix--Kaledin construction shows that c-projective -manifolds with curvature of type are precisely the submanifolds of quaternionic -manifolds which…