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An answer is a direct measurement of the composite-fermion Fermi surface.","problem_ref":null,"references":"","settled_by":"Commensurability oscillations in an imposed periodic potential, or surface-acoustic-wave resonances, showing $k_{F}$ fixed by the composite-fermion density.","status_note":"2023-2024 transport found anomalous Hall resistance near $2h/e^{2}$ at $\\nu = 1/2$, consistent with a composite Fermi liquid; no direct Fermi-surface measurement as of 2026.","title":"Composite Fermi liquid at half filling without magnetic 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