Formal verification of what? Termination? Memory-leaks? Undefined Behavior? Formal verification without qualification is about as meaningless as corporate jargo

Formal verification of what? Termination? Memory-leaks? Undefined Behavior? Formal verification without qualification is about as meaningless as corporate jargon; with qualification it is not formal verification anymore. Formal verification requires a formal specification that is based on a mathematical model of a system. Those models and the methods used to define them alone are effectively infinite.