Theorem: verus_lemma_induction_helper_neg (VerusLeanStd/GeneralInternals.lean)

State before:
n : ℤ
f : ℤ → Bool
x : ℤ
h1 : x < 0
h2 : n > 0
h3 : ∀ (i : ℤ), 0 ≤ i ∧ i < n → f i = true
h4 : ∀ (i : ℤ), i ≥ 0 ∧ f i = true → f (i + n) = true
h5 : ∀ (i : ℤ), i < n ∧ f i = true → f (i - n) = true
⊢ f x = true
Tactic:
sorry
State after:
no goals