Description: A ring's addition operation is an Abelian group operation. (Contributed by Steve Rodriguez, 9-Sep-2007) (Revised by Mario Carneiro, 21-Dec-2013) (New usage is discouraged.)
Ref | Expression | ||
---|---|---|---|
Hypothesis | ringabl.1 | |
|
Assertion | rngoablo | |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | ringabl.1 | |
|
2 | eqid | |
|
3 | eqid | |
|
4 | 1 2 3 | rngoi | |
5 | 4 | simplld | |