In this work, we will prove Cayley theorem, using category theory. We will see a different proof than the one seen in a Group Theory course, in this case we will use a famous result in category theory called the Yoneda lemma and then, to relate groups with such lemma we will take advantage of the fact that every group can be viewed as a category. This proof shows that Yoneda lemma is an extensive generalization of Cayley theorem for groups.

In this work, we will prove the Cayley-Hamilton theorem using algebraic geometry. We will see a different proof than the one seen in a linear algebra course, in this case we will use the Zariski topology, then we will take advantage of the fact that every square matrix of order n _ n, with entries in a field K, denoted by (aij)n_n can be seen as an element of the affine space of dimension n _ n over the field K and thanks to this, we can resort to algebraic sets and algebraic varieties in order to obtain some results seen in an algebraic geometry and to get a proof of the Cayley-Hamilton theorem.