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A formal method is a mathematically-based technique used to describe properties of hardware and software systems. It provides a framework within which large, complex systems may be specified, designed, analyzed, and verified in a systematic rather than ad hoc manner. A method is formal if it has a sound mathematical basis, typically given by a formal specification language In my talk I will review the seeds and early development of formal methods...

Jeannette Wing. Formal Methods: Past, Present, and Future