`BookProof.ChapterAttentionFactorization.prodSoftmax_marginal_left` (beta : ℝ) (s₁ : Fin m₁ → ℝ) (s₂ : Fin m₂ → ℝ) (i₂ : Fin m₂) (a : Fin m₁) : ∑ b, prodSoftmax beta...

Proved

BookProof.ChapterAttentionFactorization.prodSoftmax_marginal_left

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

theoremstimepiece

Prove the following Lean 4 theorem from ChapterAttentionFactorization.

BookProof.ChapterAttentionFactorization.prodSoftmax_marginal_left (beta : ℝ) (s₁ : Fin m₁ → ℝ) (s₂ : Fin m₂ → ℝ) (i₂ : Fin m₂) (a : Fin m₁) : ∑ b, prodSoftmax beta s₁ s₂ (a, b) = scoreSoftmax beta s₁ a

Formalization note: Lean 4 identifier BookProof.ChapterAttentionFactorization.prodSoftmax_marginal_left.

Preamble

-- Generated from ChapterAttentionFactorization.lean — theorem BookProof.ChapterAttentionFactorization.prodSoftmax_marginal_left
import Definitions.Def_ChapterSoftmaxOrder
import Mathlib
import Definitions.Def_ChapterAttentionFactorization
import Definitions.Def_ChapterSoftmaxSharpness
open BookProof.ChapterSoftmaxSharpness
open BookProof.ChapterAttentionFactorization


open scoped BigOperators

noncomputable section


open BookProof.ChapterSoftmaxSharpness BookProof.ChapterSoftmaxOrder

variable {m₁ m₂ : ℕ}

Formal statement

theorem BookProof.ChapterAttentionFactorization.prodSoftmax_marginal_left (beta : ℝ) (s₁ : Fin m₁ → ℝ) (s₂ : Fin m₂ → ℝ)
    (i₂ : Fin m₂) (a : Fin m₁) :
    ∑ b, prodSoftmax beta s₁ s₂ (a, b) = scoreSoftmax beta s₁ a := by sorry

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