Ring is Ideal of Itself

Theorem

Let $\struct {R, +, \circ}$ be a ring.


Then $R$ is an ideal of $R$.


Proof

From Ring is Subring of Itself, $\struct {R, +, \circ}$ is a subring of $\struct {R, +, \circ}$.

Also:

$\forall x, y \in \struct {R, +, \circ}: x \circ y \in R$

thus fulfilling the condition for $R$ to be an ideal of $R$.

$\blacksquare$


Sources

  • 1965: Seth Warner: Modern Algebra ... (previous) ... (next): Chapter $\text {IV}$: Rings and Fields: $22$. New Rings from Old
  • 1969: C.R.J. Clapham: Introduction to Abstract Algebra ... (previous) ... (next): Chapter $5$: Rings: $\S 22$. Quotient Rings: Example $40$
  • 1970: B. Hartley and T.O. Hawkes: Rings, Modules and Linear Algebra ... (previous) ... (next): $\S 2.2$: Homomorphisms: Definition $2.5$
  • 1978: Thomas A. Whitelaw: An Introduction to Abstract Algebra ... (previous) ... (next): $\S 58.1$ Ideals
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