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`BookProof.ChapterAttentionMasking.causalMask_nonempty` (i : Fin m) : (causalMask m i).Nonempty

Proved
BookProof.ChapterAttentionMasking.causalMask_nonempty

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

theoremstimepiece

Prove the following Lean 4 theorem from ChapterAttentionMasking.

BookProof.ChapterAttentionMasking.causalMask_nonempty (i : Fin m) : (causalMask m i).Nonempty

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

Preamble
-- Generated from ChapterAttentionMasking.lean — theorem BookProof.ChapterAttentionMasking.causalMask_nonempty
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.causalMask_nonempty (i : Fin m) : (causalMask m i).Nonempty := by sorry

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