Theory (mathematical logic)
= Theory (mathematical logic)
{wiki=Theory_(mathematical_logic)}
In mathematical logic, a **theory** is a formal system that consists of a set of sentences or propositions in a particular language, along with a set of axioms and inference rules that determine what can be derived or proven within that system. The sentences are typically formulated in first-order logic or another formal logical language, and they can express various mathematical statements or properties.