In this document we describe a categorification of the semiring of natural numbers. We then use this result to construct a categorification of the semiring of nonnegative rational numbers.
"Categorification of the Nonegative Rational Numbers,"
Rose-Hulman Undergraduate Mathematics Journal: Vol. 16:
2, Article 2.
Available at: https://scholar.rose-hulman.edu/rhumj/vol16/iss2/2