← Session 36 — ii′-6-DL dog-leg + side bounds; Paper A review
thinking (607 chars)
`abs_of_nonneg` is used in the project already (root namespace, works for ℝ) ✓. `abs_of_neg` — let me check usage in project... not shown in the first 8 hits. It surely exists: `abs_of_neg : a < 0 → |a| = -a`. I'll trust it; if not, `abs_of_neg` might be `abs_of_neg` in core Lean — yes it's in Lean core/Mathlib.Algebra.Order. It's standard.
Now, one more check: `norm_div` for ℂ in the near-sum term — LiTightR line 152-153 has hterm with `‖(zeroMult ρ.1 : ℂ) / (...)‖` — let me look at how they normalized it there (lines 152-178), since it's the same pattern I need. Let me read LiTightR lines 148-198.
Let me look at how LiTightR normalized the per-term norms (same pattern I need).
tool: Read
input
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"file_path": "D:\\Python\\Quantum\\research\\lean\\NguyenRH1\\NguyenRH1\\LiTightR.lean",
"offset": 148,
"limit": 50
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raw content_json (database row)
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