kdrag.utils.open_binder

kdrag.utils.open_binder(lam: QuantifierRef) → tuple[list[ExprRef], ExprRef]

Open a quantifier with fresh variables. This achieves the locally nameless representation https://chargueraud.org/research/2009/ln/main.pdf where it is harder to go wrong.

The variables are schema variables which when used in a proof may be generalized

>>> x = smt.Int("x")
>>> open_binder(smt.ForAll([x], x > 0))
([X!...], X!... > 0)