Abstract
We study hyperpolar actions on reducible symmetric spaces of the compact type. Our main result is that an indecomposable hyperpolar action on a symmetric space of the compact type is orbit equivalent to a Hermann action or of cohomogeneity one.
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KOLLROSS, A. HYPERPOLAR ACTIONS ON REDUCIBLE SYMMETRIC SPACES. Transformation Groups 22, 207–228 (2017). https://doi.org/10.1007/s00031-016-9384-7
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DOI: https://doi.org/10.1007/s00031-016-9384-7