`BookProof.ChapterAttentionMasking.maskedSoftmax_eq_zero_of_not_mem` (beta : ℝ) (s : Fin m → ℝ) {S : Finset (Fin m)} {j : Fin m} (hj : j ∉ S) : maskedSoftmax beta s S j = 0

Proved

BookProof.ChapterAttentionMasking.maskedSoftmax_eq_zero_of_not_mem

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

theoremstimepiece

Prove the following Lean 4 theorem from ChapterAttentionMasking.

BookProof.ChapterAttentionMasking.maskedSoftmax_eq_zero_of_not_mem (beta : ℝ) (s : Fin m → ℝ) {S : Finset (Fin m)} {j : Fin m} (hj : j ∉ S) : maskedSoftmax beta s S j = 0

Formalization note: Lean 4 identifier BookProof.ChapterAttentionMasking.maskedSoftmax_eq_zero_of_not_mem.

Preamble

-- Generated from ChapterAttentionMasking.lean — theorem BookProof.ChapterAttentionMasking.maskedSoftmax_eq_zero_of_not_mem
import Definitions.Def_ChapterSoftmaxSharpness
import Definitions.Def_ChapterSoftmaxOrder
import Mathlib
import Definitions.Def_ChapterAttentionMasking
open BookProof.ChapterAttentionMasking


open scoped BigOperators

noncomputable section


open BookProof.ChapterSoftmaxSharpness BookProof.ChapterSoftmaxOrder

variable {m : ℕ}

Formal statement

theorem BookProof.ChapterAttentionMasking.maskedSoftmax_eq_zero_of_not_mem (beta : ℝ) (s : Fin m → ℝ) {S : Finset (Fin m)}
    {j : Fin m} (hj : j ∉ S) : maskedSoftmax beta s S j = 0 := by sorry

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