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An answer is momentum-resolved gap data at $T << T_c$ (ARPES with sub-0.1 meV resolution, quasiparticle interference, or field-angle-resolved specific heat) on all three sheets, resolving node versus minimum.","problem_ref":"6ec35792fc502701a3c9c4dc33b0300bee8604e5e02117a58892c72eb62f8402","references":"","settled_by":"Momentum-resolved gap maps on all three sheets at temperatures well below $T_c$.","status_note":"Thermal conductivity (2017) indicates vertical line nodes, and quasiparticle interference (2020) places nodes or deep minima along the zone diagonals on the $\\alpha$ and $\\beta$ sheets; $\\gamma$-sheet gap structure and true node versus minimum remain open.","title":"Location of gap nodes on the $\\mathrm{Sr_2RuO_4}$ Fermi 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