@@ -24,9 +24,10 @@ per-piece replacement energies `E_l` and uniform savings
2424 - ** (II)** every ` t ` lies in at most two pieces (two-fold overlap),
2525 - ** (III)** ` {t : f t ≥ m₀ − 1/N} ⊆ ⋃ pieces ` .
2626
27- This is the non-trivial content extracted from the DLT-style
28- 1D cover refinement (Lebesgue-number cover, bounded
29- smallest-index refinement induction, skip-2 parity rescue).
27+ This is the non-trivial content extracted from the
28+ De Lellis–Tasnady-style 1D cover refinement (Lebesgue-number
29+ cover, bounded smallest-index refinement induction, skip-2
30+ parity rescue).
3031
3132### Sup-reduction bookkeeping corollary — ` CombArg.exists_sup_reduction_of_cover `
3233
@@ -188,10 +189,11 @@ four public declarations make no GMT references and stand for
188189the four pieces the literature recombines at every instantiation.
189190` LocalWitness K f t ε ` carries the abstract per-parameter
190191local-reducer data. ` exists_refinement ` is the formal counterpart
191- of DLT §3.2 Step 1, the interval refinement that turns a family
192- of local witnesses on the near-critical set into a finite cover
193- with two-fold overlap. ` exists_sup_reduction_of_cover ` is the
194- formal counterpart of DLT §3.2 Step 2, the scalar bookkeeping
192+ of De Lellis–Tasnady §3.2 Step 1, the interval refinement that
193+ turns a family of local witnesses on the near-critical set into
194+ a finite cover with two-fold overlap. ` exists_sup_reduction_of_cover `
195+ is the formal counterpart of De Lellis–Tasnady §3.2 Step 2, the
196+ scalar bookkeeping
195197that turns such a cover into a sup-reducing competitor. The
196198chained one-parameter step ` exists_sup_reduction ` composes these
197199two into a single call.
@@ -212,28 +214,30 @@ instantiated forms — they are exactly the same definitions
212214either way; what changes is that this min-max-side data flows in
213215as the inputs.
214216
215- ### The instantiation: ` LocalWitness ` ← DLT Lemma 3.1
217+ ### The instantiation: ` LocalWitness ` from the local replacement lemma
216218
217219The ` LocalWitness ` structure was designed to be the data shape
218- DLT Lemma 3.1 produces, with each field naming a specific piece
219- of the GMT-side replacement data. DLT's open interval
220- ` (a_i, b_i) ⊆ [0,1] ` on which the local replacement saves energy
221- becomes the ` neighborhood ` field; the boundary energy of the
222- replaced sweepout, ` s ↦ ℋⁿ(∂Ω̃_s) ` , becomes ` replacementEnergy ` ;
223- its continuity in ` s ` (which DLT treats implicitly through the
224- continuity of the replaced family in the inserted parameter)
225- becomes the ` replacementEnergy_continuous ` obligation that the
226- GMT side must discharge explicitly; and DLT's quantitative
227- inequality ` f(s) − ℋⁿ(∂Ω̃_s) ≥ 1/(4N) ` on ` (a_i, b_i) ` becomes
220+ that the De Lellis–Tasnady local replacement lemma
221+ ([ DLT13] Lemma 3.1) produces, with each field naming a specific
222+ piece of the GMT-side replacement data. The open interval
223+ ` (a_i, b_i) ⊆ [0,1] ` on which the local replacement saves
224+ energy becomes the ` neighborhood ` field; the boundary energy of
225+ the replaced sweepout, ` s ↦ ℋⁿ(∂Ω̃_s) ` , becomes
226+ ` replacementEnergy ` ; its continuity in ` s ` (which the local
227+ replacement lemma treats implicitly through the continuity of
228+ the replaced family in the inserted parameter) becomes the
229+ ` replacementEnergy_continuous ` obligation that the GMT side
230+ must discharge explicitly; and the quantitative inequality
231+ ` f(s) − ℋⁿ(∂Ω̃_s) ≥ 1/(4N) ` on ` (a_i, b_i) ` becomes
228232` saving_bound ` . The full mapping:
229233
230234| Library field | The corresponding piece of the original proof |
231235| ---| ---|
232- | ` neighborhood : Set unitInterval ` | DLT's open interval ` (a_i, b_i) ⊆ [0,1] ` around ` t ` . |
236+ | ` neighborhood : Set unitInterval ` | The open interval ` (a_i, b_i) ⊆ [0,1] ` around ` t ` . |
233237| ` isOpen_neighborhood ` + ` t_mem ` | Openness of the interval; the parameter ` t ` lies in it. |
234238| ` replacementEnergy : unitInterval → ℝ ` | ` s ↦ ℋⁿ(∂Ω̃_s) ` , the boundary energy of the replaced sweepout. |
235239| ` replacementEnergy_continuous ` | Continuity of ` s ↦ ℋⁿ(∂Ω̃_s) ` in ` s ` . |
236- | ` saving_bound ` | The quantitative DLT 3.1 inequality ` f(s) − ℋⁿ(∂Ω̃_s) ≥ 1/(4N) ` for ` s ∈ (a_i, b_i) ` . |
240+ | ` saving_bound ` | The quantitative inequality ` f(s) − ℋⁿ(∂Ω̃_s) ≥ 1/(4N) ` for ` s ∈ (a_i, b_i) ` . |
237241
238242### The proof chain: from sup reduction to contradiction
239243
@@ -305,8 +309,9 @@ theorem minmax_contradiction
305309The three ` YourGMT.* ` identifiers mark the GMT-side
306310responsibility: ` YourGMT.choose_N ` picks ` N ` so that ` 1/(4N) `
307311beats the admissible class's contradiction window;
308- ` YourGMT.localWitness_of_DLT ` is the GMT formalization of DLT
309- Lemma 3.1, returning a per-` t ` ` LocalWitness ` ; and
312+ ` YourGMT.localWitness_of_DLT ` is the GMT formalization of the
313+ local replacement lemma ([ DLT13] Lemma 3.1), returning a
314+ per-` t ` ` LocalWitness ` ; and
310315` YourGMT.lift_sweepout ` converts the scalar ` f' ` (with its
311316modification set ` S ` ) back to a sweepout in ` 𝒜 ` .
312317
@@ -321,8 +326,8 @@ modification set `S`, and must lift back to a sweepout in `𝒜` on
321326the GMT side; the ` f' = f ` off ` S ` guarantee is designed to make
322327this lift mechanical. Continuity of ` replacementEnergy ` in the
323328inserted parameter falls on the consumer to discharge explicitly,
324- since DLT 3.1 supplies it only implicitly through the continuity
325- of the replaced family. The library is pinned to
329+ since the local replacement lemma supplies it only implicitly
330+ through the continuity of the replaced family. The library is pinned to
326331` leanprover/lean4:v4.30.0-rc2 ` plus the Mathlib revision in
327332` lake-manifest.json ` , so bumps on either side may require
328333coordination. The library itself uses only the three standard
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