(ch:set:theory)=
# Algebra
This chapter provides a basic introduction to the
notion of sets, relations, functions, sequences,
groups, rings, polynomials, etc..
(sec:alg:algebraic_structure)=
## Algebraic Structures
In mathematics, the term *algebraic structure* refers to an arbitrary set
with one or more operations defined on it.
* Simpler algebraic structures include groups, rings, and fields.
* More complex algebraic structures like vector spaces are built
on top of the simpler structures.