"mathematical logic." YourDictionary, n.d. Web. 12 October 2018. <http://www.yourdictionary.com/mathematical-logic>.
mathematical logic. (n.d.). Retrieved October 12th, 2018, from http://www.yourdictionary.com/mathematical-logic
(logic) A subfield of logic and mathematics consisting of both the mathematical study of logic and the application of this study to other areas of mathematics, exemplified by questions on the expressivepower of formal logics and the deductive power of formal proof systems.
English Wiktionary. Available under CC-BY-SA license.