## Name: $\mathbb C$: the field of complex numbers

Description: With real numbers $\mathbb R$, $\mathbb R[x]/(x^2+1)$ OR the set of real matrices of form $\left[\begin{smallmatrix}a&b\\-b&a\end{smallmatrix}\right]$ with determinant greater than $0$. OR the real Clifford algebra for signature (-)

Krull dimension: 0

Keywords
matrix ring
quotient ring
subring