Mathematical logic

Mathematical logic is the study of formal logic within mathematics. Major subareas include model theory, proof theory, set theory, and recursion theory (also known as computability theory). Research in mathematical logic commonly addresses the mathematical properties of formal systems of logic such as their expressive or deductive power.

Extends: [Mathematical logic](https://wikipedia.org.ai/Mathematical logic), Logic, [Philosophy of mathematics](https://wikipedia.org.ai/Philosophy of mathematics)