According to or using mathematics.

plural of mathematician

(computing) Any of a set of subroutines supplied with a language or system that can be called to perform standard mathematical functions efficiently

(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 expressive power of formal logics and the deductive power of formal proof systems.

(computer science) A study of formal semantics of computer languages, such as denotational semantics.

plural of mathematical logic

The use of mathematics to construct formal theories about society.

(mathematics) A set together with a collection of mathematical objects such as other sets, relations or operations which endow it with additional structure.

(informal) One whose mathematical skills are so remarkable as to resemble magic.

plural of mathemagician