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← Session 27 — ii′-5c/5d: Davenport disc + FE-reflection bounds

#1373 assistant 2026-08-23 05:53:42.804 UTC · 493→1905 tok open ⤢
thinking (4262 chars)
`Finset.prod_image [DecidableEq ι] {s : Finset κ} {g : κ → ι} : Set.InjOn g s → ∏ x ∈ s.image g, f x = ∏ x ∈ s, f (g x)` — so sum_image is the to_additive version: `Finset.sum_image [DecidableEq α] {s : Finset β} {g : β → α} : Set.InjOn g s → ∑ x ∈ s.image g, f x = ∑ x ∈ s, f (g x)`. The inner function is named **g**, not f! So my named arg should be `(g := fun ρ : ℂ => 1 - ρ)` — that's why (f := ...) mis-elaborated (f is the SUMMAND {f : α → γ} implicit). The pattern `∑ x ∈ Finset.image (fun a => a - ?m.74) ?m.55, (1 - x)` — f (summand) got unified with (1 − x)?? whatever — fix: use (g := ...): rw [nearZeros_neg_eq_image, Finset.sum_image (g := fun ρ : ℂ => 1 - ρ) (fun a _ b _ hab => sub_left_inj.mp hab)] Now the convention check for add_le_add_left/right — the Mathlib grep for the core lemma didn't show (they're in Mathlib/Algebra/Order/... probably as `add_le_add_left (h : a ≤ b) (c) : c + a ≤ c + b`? The classic mathlib4 convention: add_le_add_left (h : a ≤ b) (c) : c + a ≤ c + b; add_le_add_right (h : a ≤ b) (c) : a + c ≤ b + c. But the ERROR messages showed add_le_add_left (abs_arg_le_pi w) ?m : |w.arg| + ?m ≤ π + ?m (i.e. a+c ≤ b+c) and add_le_add_right (norm_add_le ..) ?m : ?m + ‖A+B‖ ≤ ?m + (..) (i.e. c+a ≤ c+b). So in THIS Mathlib they're SWAPPED from classic. Fine — I've adapted: norm_log uses add_le_add_right (for log‖w‖ + |arg| ≤ log‖w‖ + π = c + a ≤ c + b form ✓ matches the observed add_le_add_right behavior c + _ ≤ c + _). And the digamma calc step: `add_le_add_left (norm_add_le _ _) _` for ‖A+B‖ + ‖C‖ ≤ (‖A‖+‖B‖) + ‖C‖ — a + c ≤ b + c form ✓ matches observed add_le_add_left behavior. And in gammaR_bracket_norm_le's calc: ``` refine (norm_sub_le _ _).trans ?_ -- ‖X − D‖ ≤ ‖X‖ + ‖D‖, X = A+B+C refine add_le_add_right ?_ _ -- WRONG now: need (‖A‖+‖B‖+‖C‖) + ‖D‖ — a+c ≤ b+c form = add_le_add_LEFT refine (norm_add_le _ _).trans ?_ exact add_le_add_right (norm_add_le _ _) _ -- ‖A+B‖ + ‖C‖ ≤ ‖A‖+‖B‖+‖C‖: a+c form = LEFT ``` Wait let me recheck: the goal after `refine (norm_sub_le _ _).trans ?_`: ‖A+B+C‖ + ‖D‖ ≤ (‖A‖+‖B‖+‖C‖) + ‖D‖. Per new convention: add_le_add_left (h : a≤b) (c) : a + c ≤ b + c — the error at line 420 earlier showed add_le_add_left (abs_arg_le_pi w) ?m : |w.arg| + ?m ≤ π + ?m — YES a + c ≤ b + c. So `refine add_le_add_left ?_ _` gives goal ‖A+B+C‖ ≤ ‖A‖+‖B‖+‖C‖ ✓. Then (norm_add_le _ _).trans : ‖(A+B)+C‖ ≤ ‖A+B‖ + ‖C‖ then ≤ (‖A‖+‖B‖)+‖C‖: add_le_add_left (norm_add_le _ _) _ : ‖A+B‖ + ‖C‖ ≤ (‖A‖+‖B‖) + ‖C‖ ✓. So: ``` refine (norm_sub_le _ _).trans ?_ refine add_le_add_left ?_ _ refine (norm_add_le _ _).trans ?_ exact add_le_add_left (norm_add_le _ _) _ ``` And in norm_digamma_le_log_of I already fixed to add_le_add_left (norm_add_le _ _) _ for the ‖A+B‖+‖C‖ step ✓ (the previous fix used add_le_add_left — wait I wrote `exact add_le_add_left (norm_add_le _ _) _` in the fix — under the new convention that's a+c ≤ b+c ✓ correct!). Also fix: - h1: 3/w.im² ≤ 1/4 (not 1): rw [div_le_iff... let me: `have h1 : 3 / w.im^2 ≤ 1/4` — from hsq : 25 ≤ w.im²: 3/w.im² ≤ 3/25 ≤ 1/4: rw [div_le_div_iff (by positivity: 0 < w.im^2) (by norm_num)]? 3/w.im² ≤ 1/4 ⟺ 3*4 ≤ 1*w.im² ⟺ 12 ≤ w.im² ✓ (25 ≤). div_le_iff₀ (hb : 0 < b) : a/b ≤ c ↔ a ≤ c*b (banked journal-024: div_le_iff₀ (hc : 0 < c) : a/c ≤ b ↔ a ≤ b*c). So rw [div_le_iff₀ (by linarith [hsq] : (0:ℝ) < w.im^2)]; nlinarith [hsq]: goal 3 ≤ (1/4)*w.im²: from 25 ≤ w.im²: (1/4)*25 = 6.25 ≥ 3 ✓ nlinarith. - h4: (1/2)/‖w‖ ≤ 1/4: div_le_iff₀ (0 < ‖w‖): 1/2 ≤ (1/4)*‖w‖ ⟺ 2 ≤ ‖w‖ ✓ (5 ≤ ‖w‖): nlinarith [hwnorm5]. - hlogpi: π ≤ 7/2: Real.pi_lt_d2.le.trans (by norm_num) — 3.15 ≤ 3.5 ✓. - final linarith [h1, h2, h4, hlogpi]: 3/w.im² + (log‖w‖+π) + 1/2/‖w‖ ≤ 1/4 + (log|t|+1) + 7/2 + 1/4 = log|t| + 5 ✓. Wait — h2 gives log‖w‖ ≤ log|t| + 1; the goal's middle component is Real.log ‖w‖ + Real.pi: so need log‖w‖ + π ≤ (log|t|+1) + 7/2. linarith with h2, hlogpi ✓. And hsre fix: `abs_le.mpr ⟨by linarith [hσlo], by linarith [hσhi]⟩`. Let me also see what line 588's unsolved goals actually was — probably the final calc step `_ ≤ 4 * (Real.log |t|)^2` or the hrat block. The visible context ended at hev1. Since several errors cascaded, recompile after fixes and see.
`Finset.sum_image`'s inner function argument is named `g` (to_additive of prod_image) — that's the mismatch. Also this Mathlib has add_le_add_left/right in the swapped convention. Fixing all.
tool: Edit
input
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  "file_path": "D:\\Python\\Quantum\\research\\lean\\NguyenRH1\\NguyenRH1\\LiReflect.lean",
  "old_string": "  rw [nearZeros_neg_eq_image,\n    Finset.sum_image (f := fun \u03c1 : \u2102 => 1 - \u03c1) (fun a _ b _ hab => sub_left_inj.mp hab)]",
  "new_string": "  rw [nearZeros_neg_eq_image,\n    Finset.sum_image (g := fun \u03c1 : \u2102 => 1 - \u03c1) (fun a _ b _ hab => sub_left_inj.mp hab)]"
}
raw content_json (database row)
[{"type":"thinking","thinking":"`Finset.prod_image [DecidableEq ι] {s : Finset κ} {g : κ → ι} : Set.InjOn g s → ∏ x ∈ s.image g, f x = ∏ x ∈ s, f (g x)` — so sum_image is the to_additive version: `Finset.sum_image [DecidableEq α] {s : Finset β} {g : β → α} : Set.InjOn g s → ∑ x ∈ s.image g, f x = ∑ x ∈ s, f (g x)`. The inner function is named **g**, not f! So my named arg should be `(g := fun ρ : ℂ => 1 - ρ)` — that's why (f := ...) mis-elaborated (f is the SUMMAND {f : α → γ} implicit). The pattern `∑ x ∈ Finset.image (fun a => a - ?m.74) ?m.55, (1 - x)` — f (summand) got unified with (1 − x)?? whatever — fix: use (g := ...):\n\nrw [nearZeros_neg_eq_image, Finset.sum_image (g := fun ρ : ℂ => 1 - ρ) (fun a _ b _ hab => sub_left_inj.mp hab)]\n\nNow the convention check for add_le_add_left/right — the Mathlib grep for the core lemma didn't show (they're in Mathlib/Algebra/Order/... probably as `add_le_add_left (h : a ≤ b) (c) : c + a ≤ c + b`? The classic mathlib4 convention: add_le_add_left (h : a ≤ b) (c) : c + a ≤ c + b; add_le_add_right (h : a ≤ b) (c) : a + c ≤ b + c. But the ERROR messages showed add_le_add_left (abs_arg_le_pi w) ?m : |w.arg| + ?m ≤ π + ?m (i.e. a+c ≤ b+c) and add_le_add_right (norm_add_le ..) ?m : ?m + ‖A+B‖ ≤ ?m + (..) (i.e. c+a ≤ c+b). So in THIS Mathlib they're SWAPPED from classic. Fine — I've adapted: norm_log uses add_le_add_right (for log‖w‖ + |arg| ≤ log‖w‖ + π = c + a ≤ c + b form ✓ matches the observed add_le_add_right behavior c + _ ≤ c + _). And the digamma calc step: `add_le_add_left (norm_add_le _ _) _` for ‖A+B‖ + ‖C‖ ≤ (‖A‖+‖B‖) + ‖C‖ — a + c ≤ b + c form ✓ matches observed add_le_add_left behavior.\n\nAnd in gammaR_bracket_norm_le's calc:\n```\n        refine (norm_sub_le _ _).trans ?_   -- ‖X − D‖ ≤ ‖X‖ + ‖D‖, X = A+B+C\n        refine add_le_add_right ?_ _        -- WRONG now: need (‖A‖+‖B‖+‖C‖) + ‖D‖ — a+c ≤ b+c form = add_le_add_LEFT\n        refine (norm_add_le _ _).trans ?_\n        exact add_le_add_right (norm_add_le _ _) _  -- ‖A+B‖ + ‖C‖ ≤ ‖A‖+‖B‖+‖C‖: a+c form = LEFT\n```\nWait let me recheck: the goal after `refine (norm_sub_le _ _).trans ?_`: ‖A+B+C‖ + ‖D‖ ≤ (‖A‖+‖B‖+‖C‖) + ‖D‖. Per new convention: add_le_add_left (h : a≤b) (c) : a + c ≤ b + c — the error at line 420 earlier showed add_le_add_left (abs_arg_le_pi w) ?m : |w.arg| + ?m ≤ π + ?m — YES a + c ≤ b + c. So `refine add_le_add_left ?_ _` gives goal ‖A+B+C‖ ≤ ‖A‖+‖B‖+‖C‖ ✓. Then (norm_add_le _ _).trans : ‖(A+B)+C‖ ≤ ‖A+B‖ + ‖C‖ then ≤ (‖A‖+‖B‖)+‖C‖: add_le_add_left (norm_add_le _ _) _ : ‖A+B‖ + ‖C‖ ≤ (‖A‖+‖B‖) + ‖C‖ ✓. So:\n```\n        refine (norm_sub_le _ _).trans ?_\n        refine add_le_add_left ?_ _\n        refine (norm_add_le _ _).trans ?_\n        exact add_le_add_left (norm_add_le _ _) _\n```\n\nAnd in norm_digamma_le_log_of I already fixed to add_le_add_left (norm_add_le _ _) _ for the ‖A+B‖+‖C‖ step ✓ (the previous fix used add_le_add_left — wait I wrote `exact add_le_add_left (norm_add_le _ _) _` in the fix — under the new convention that's a+c ≤ b+c ✓ correct!).\n\nAlso fix:\n- h1: 3/w.im² ≤ 1/4 (not 1): rw [div_le_iff... let me: `have h1 : 3 / w.im^2 ≤ 1/4` — from hsq : 25 ≤ w.im²: 3/w.im² ≤ 3/25 ≤ 1/4: rw [div_le_div_iff (by positivity: 0 < w.im^2) (by norm_num)]? 3/w.im² ≤ 1/4 ⟺ 3*4 ≤ 1*w.im² ⟺ 12 ≤ w.im² ✓ (25 ≤). div_le_iff₀ (hb : 0 < b) : a/b ≤ c ↔ a ≤ c*b (banked journal-024: div_le_iff₀ (hc : 0 < c) : a/c ≤ b ↔ a ≤ b*c). So rw [div_le_iff₀ (by linarith [hsq] : (0:ℝ) < w.im^2)]; nlinarith [hsq]: goal 3 ≤ (1/4)*w.im²: from 25 ≤ w.im²: (1/4)*25 = 6.25 ≥ 3 ✓ nlinarith.\n- h4: (1/2)/‖w‖ ≤ 1/4: div_le_iff₀ (0 < ‖w‖): 1/2 ≤ (1/4)*‖w‖ ⟺ 2 ≤ ‖w‖ ✓ (5 ≤ ‖w‖): nlinarith [hwnorm5].\n- hlogpi: π ≤ 7/2: Real.pi_lt_d2.le.trans (by norm_num) — 3.15 ≤ 3.5 ✓.\n- final linarith [h1, h2, h4, hlogpi]: 3/w.im² + (log‖w‖+π) + 1/2/‖w‖ ≤ 1/4 + (log|t|+1) + 7/2 + 1/4 = log|t| + 5 ✓.\n\nWait — h2 gives log‖w‖ ≤ log|t| + 1; the goal's middle component is Real.log ‖w‖ + Real.pi: so need log‖w‖ + π ≤ (log|t|+1) + 7/2. linarith with h2, hlogpi ✓.\n\nAnd hsre fix: `abs_le.mpr ⟨by linarith [hσlo], by linarith [hσhi]⟩`.\n\nLet me also see what line 588's unsolved goals actually was — probably the final calc step `_ ≤ 4 * (Real.log |t|)^2` or the hrat block. The visible context ended at hev1. Since several errors cascaded, recompile after fixes and see.","signature":""},{"type":"text","text":"`Finset.sum_image`'s inner function argument is named `g` (to_additive of prod_image) — that's the mismatch. Also this Mathlib has add_le_add_left/right in the swapped convention. Fixing all."},{"type":"tool_use","id":"Edit_83","name":"Edit","input":{"file_path":"D:\\Python\\Quantum\\research\\lean\\NguyenRH1\\NguyenRH1\\LiReflect.lean","old_string":"  rw [nearZeros_neg_eq_image,\n    Finset.sum_image (f := fun ρ : ℂ => 1 - ρ) (fun a _ b _ hab => sub_left_inj.mp hab)]","new_string":"  rw [nearZeros_neg_eq_image,\n    Finset.sum_image (g := fun ρ : ℂ => 1 - ρ) (fun a _ b _ hab => sub_left_inj.mp hab)]"},"extra_content":null}]