simp at hmarked
aig : AIG Nat
lhs rhs : Nat
linv rinv : Bool
idx : Nat
hbound : idx < aig.decls.size
hmarked : (mkArray aig.decls.size false)[idx] = true
heq : aig.decls[idx] = Decl.gate lhs rhs linv rinv
⊢ (mkArray aig.decls.size false)[lhs] = true ∧ (mkArray aig.decls.size false)[rhs] = true
no goals