Given the question: Information: - A mathematical problem is a problem that is amenable to being represented, analyzed, and possibly solved, with the methods of mathematics. This can be a real-world problem, such as computing the orbits of the planets in the solar system, or a problem of a more abstract nature, such as Hilbert's problems.<br> It can also be a problem referring to the nature of mathematics itself, such as Russell's Paradox. - Eben Matlis ( born 1923 ) is a mathematician known for his contributions to the theory of rings and modules , especially for his work with injective modules over commutative Noetherian rings , and his introduction of Matlis duality . Matlis earned his Ph.D. at the University of Chicago in 1958 , with Irving Kaplansky as advisor . He is now an emeritus professor at Northwestern University . - In mathematics, especially in the area of abstract algebra known as module theory, an injective module is a module "Q" that shares certain desirable properties with the Z-module Q of all rational numbers. Specifically, if "Q" is a submodule of some other module, then it is already a direct summand of that module; also, given a submodule of a module "Y", then any module homomorphism from this submodule to "Q" can be extended to a homomorphism from all of "Y" to "Q". This concept is dual to that of projective modules. Injective modules were introduced in and are discussed in some detail in the textbook . - Mathematics (from Greek "mathma", knowledge, study, learning) is the study of topics such as quantity (numbers), structure, space, and change. There is a range of views among mathematicians and philosophers as to the exact scope and definition of mathematics. - A mathematician is someone who uses an extensive knowledge of mathematics in his/her work, typically to solve mathematical problems. After reading the paragraphs above, we are interested in knowing the entity with which 'eben matlis' exhibits the relationship of 'field of work'. Find the answer from the choices below. Choices: - algebra - mathematician - mathematics - nature
The answer is:
algebra