Real Numbers under Addition form Infinite Abelian Group

Theorem
Let $$\mathbb{R}$$ be the set of real numbers.

The structure $$\left({\mathbb{R}, +}\right)$$ is an infinite abelian group.

Proof
Taking the group axioms in turn:

G0: Closure
Real Addition is Closed.

G1: Associativity
Real Addition is Associative.

G2: Identity
The identity element of $$\left({\mathbb{R}, +}\right)$$ is the real number $$0$$:

G3: Inverses
The inverse of $$x \in \left({\mathbb{R}, +}\right)$$ is $$-x$$:

C: Commutativity
Real Addition is Commutative.

Infinite
Real Numbers are Infinite.