[Merged by Bors] - feat(model_theory/terms_and_formulas): Prenex Normal Form #12558
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Defines `first_order.language.bounded_formula.to_prenex`, a function which takes a formula and outputs an equivalent formula in prenex normal form. Proves inductive principles based on the fact that every formula is equivalent to one in prenex normal form.
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Defines
first_order.language.bounded_formula.to_prenex, a function which takes a formula and outputs an equivalent formula in prenex normal form.Proves inductive principles based on the fact that every formula is equivalent to one in prenex normal form.