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An answer specifies the order parameter or topological character and accounts for the Fermi arcs, the Knight-shift suppression, and the drop of Hall carrier density from $1+p$ to p near $p*$.","problem_ref":"946651e45560029973e85184727aeb29e0c77ad6e6c7e6779b82d81a1358b32c","references":"","settled_by":"A symmetry-resolved or thermodynamic measurement establishing a phase transition at $T*$, plus a theory that reproduces the carrier-density change at $p*$ and the arc spectrum.","status_note":"","title":"What is the pseudogap state of underdoped 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