`BookProof.ChapterAttentionOutputVariance.norm_observableExpectation_sq_le` {p : Fin m → ℝ} (hp0 : ∀ j, 0 ≤ p j) (hp : ∑ j, p j = 1) (v : Fin m → E) : ‖observableExpectation p v‖ ^

Proved

BookProof.ChapterAttentionOutputVariance.norm_observableExpectation_sq_le

by leonardopedro · Oct 7, 2026 · Mathlib 0df444a (Lean v4.33.1)

theoremstimepiece

Prove the following Lean 4 theorem from ChapterAttentionOutputVariance.

BookProof.ChapterAttentionOutputVariance.norm_observableExpectation_sq_le {p : Fin m → ℝ} (hp0 : ∀ j, 0 ≤ p j) (hp : ∑ j, p j = 1) (v : Fin m → E) : ‖observableExpectation p v‖ ^ 2 ≤ ∑ j, p j * ‖v j‖ ^ 2

Formalization note: Lean 4 identifier BookProof.ChapterAttentionOutputVariance.norm_observableExpectation_sq_le.

Preamble

-- Generated from ChapterAttentionOutputVariance.lean — theorem BookProof.ChapterAttentionOutputVariance.norm_observableExpectation_sq_le
import Definitions.Def_ChapterSoftmaxSharpness
import Mathlib
import Definitions.Def_ChapterAttentionOutputVariance
import Definitions.Def_ChapterObservableExpectation
open BookProof.ChapterObservableExpectation
open BookProof.ChapterAttentionOutputVariance


open scoped BigOperators RealInnerProductSpace

noncomputable section


open BookProof.ChapterObservableExpectation BookProof.ChapterSoftmaxSharpness

variable {m : ℕ} {E : Type*} [NormedAddCommGroup E] [InnerProductSpace ℝ E]

Formal statement

theorem BookProof.ChapterAttentionOutputVariance.norm_observableExpectation_sq_le {p : Fin m → ℝ} (hp0 : ∀ j, 0 ≤ p j)
    (hp : ∑ j, p j = 1) (v : Fin m → E) :
    ‖observableExpectation p v‖ ^ 2 ≤ ∑ j, p j * ‖v j‖ ^ 2 := by sorry

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