All type D^k spacetimes are identified as degenerate Kundt metrics obeying precise conditions on their metric functions, and any two can be distinguished by their scalar polynomial curvature invariants.
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Locally Boost Isotropic Spacetimes and the Type ${\bf D}^k$ Condition
All type D^k spacetimes are identified as degenerate Kundt metrics obeying precise conditions on their metric functions, and any two can be distinguished by their scalar polynomial curvature invariants.