Soundness Theorem

In logic, soundness refers to a property of either arguments or formal deductive systems. An argument is sound if it is both valid in form and contains no false premises. A formal system is sound, under the soundness theorem, when every well-formed formula provable in the system is logically valid relative to the system's logical semantics; the first property applies mainly to introductory deductive reasoning, while the second belongs to metalogic and mathematical logic. This description is adapted from Wikipedia contributors under CC BY-SA 4.0; changes were made. https://creativecommons.org/licenses/by-sa/4.0/