Ring Zero is Idempotent
Jump to navigation
Jump to search
Theorem
Let $\struct {R, +, \circ}$ be a ring whose ring zero is $0_R$.
Then $0_R$ is an idempotent element of $R$ under the ring product $\circ$:
- $0_R \circ 0_R = 0_R$
Proof
By Ring Product with Zero (applied to $0_R$):
- $0_R \circ 0_R = 0_R$
which was to be proven.
$\blacksquare$