Commit 2022-03-18 18:32 290ad757

feat(model_theory/terms_and_formulas): Atomic, Quantifier-Free, and Prenex Formulas (#12557) Provides a few induction principles for formulas Defines atomic formulas with first_order.language.bounded_formula.is_atomic Defines quantifier-free formulas with first_order.language.bounded_formula.is_qf Defines first_order.language.bounded_formula.is_prenex indicating that a formula is in prenex normal form.