add api for slice/vec/array - #1237
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oliver-butterley
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July 28, 2026 15:32
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TODO: /-- Map a function over an `Array`, preserving the length. -/
def Array.map {α : Type u} {β : Type v} {n : Usize} (f : α → β) (a : Array α n) : Array β n :=
⟨a.val.map f, by simp [a.property]⟩EDIT: this def and two lemmas added |
sonmarcho
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Aug 19, 2026
| theorem Array.val_make {α : Type u} (n : Usize) (l : List α) (h : l.length = n) : | ||
| (Array.make n l h).val = l := rfl | ||
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| @[scalar_tac Array.make n l h, grind =] |
sonmarcho
reviewed
Aug 19, 2026
| Array.make n a.val h = a := rfl | ||
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| theorem Array.make_inj {α : Type u} {n : Usize} (l₁ l₂ : List α) (h₁ : l₁.length = n) | ||
| (h₂ : l₂.length = n) : Array.make n l₁ h₁ = Array.make n l₂ h₂ ↔ l₁ = l₂ := |
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I think grind has an attribute for this kind of injectivity lemmas
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This PR adds various basic results for slice/vec/array that were not yet present in Aeneas but fit the pattern of what is included there and which help to make smooth proofs of spec theorems downstream.