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Exact Relaxed Energy On The Closure Domain

Proved
FunctionalInequalities.Energy.PreEnergy.sequentialRelaxation_ofLinearPMap_of_mem_readable

by Lazyfill · Oct 26, 2026 · Mathlib 0df444a (Lean v4.33.1)

functional-inequalitieskls-conjecturekls-modularkls-readablelog-concave

This theorem identifies the sequential relaxation of a closable partial linear operator on the domain of its closure.

Let XXX be a real normed space, let HHH be a complete real Hilbert space, and let T:X⇢HT:X\dashrightarrow HT:X⇢H be closable. For every x∈dom⁡(T‾)x\in\operatorname{dom}(\overline T)x∈dom(T),

sequentialRelaxation⁡T(x)=∥T‾x∥+ 2.\operatorname{sequentialRelaxation}_{T}(x) = \|\overline T x\|_{+}^{\,2}.sequentialRelaxationT​(x)=∥Tx∥+2​.

The left side is the ENNReal-valued sequential relaxation of the pre-energy PreEnergy.ofLinearPMap T; the right side is the square of the NNReal norm, coerced to ENNReal. The declaration is sequentialRelaxation_ofLinearPMap_of_mem_readable, and the equality is asserted only for points in the closure domain.

Original Lean declaration header

Within namespace FunctionalInequalities.Energy.PreEnergy. Shown in its original module context. Proof omitted.

theorem sequentialRelaxation_ofLinearPMap_of_mem (hT : T.IsClosable) (x : T.closure.domain) :
    (ofLinearPMap T).sequentialRelaxation x = (‖T.closure x‖₊ ^ 2 : NNReal)

Module navigation

Module: Energy/Relaxation/LinearPMap.

Definition modules: Energy/Form/Functional, Energy/Relaxation/Basic.

Supporting theorems: mem_closure_domain_of_frequently, sequentialRelaxation_ofLinearPMap_le.

Previous: sequentialRelaxation_ofLinearPMap_of_notMem.

Source excerpt, lines 358–359 · Frozen source 408915f.

Preamble
import Definitions.Def_KLSModular_FunctionalInequalities_Energy_Relaxation_LinearPMap

variable {X : Type*} [NormedAddCommGroup X] [NormedSpace ℝ X]
  {H : Type*} [NormedAddCommGroup H] [InnerProductSpace ℝ H] [CompleteSpace H]
variable (T : X →ₗ.[ℝ] H)
Formal statement

theorem FunctionalInequalities.Energy.PreEnergy.sequentialRelaxation_ofLinearPMap_of_mem_readable (hT : T.IsClosable) (x : T.closure.domain) :
    (ofLinearPMap T).sequentialRelaxation x = (‖T.closure x‖₊ ^ 2 : NNReal) := by sorry
Source
Lean source: https://github.com/human-ai-mathematics/kls-lean/blob/408915f/formalization/FunctionalInequalities/Energy/Relaxation/LinearPMap.lean#L357-L382 (repository human-ai-mathematics/kls-lean, commit 408915f, module `FunctionalInequalities.Energy.Relaxation.LinearPMap`, declaration `FunctionalInequalities.Energy.PreEnergy.sequentialRelaxation_ofLinearPMap_of_mem`; the repository is private at upload time).

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