Description: An Abelian group operation is commutative. (Contributed by NM, 26-Aug-2011)
Ref | Expression | ||
---|---|---|---|
Hypotheses | ablcom.b | |
|
ablcom.p | |
||
Assertion | ablcom | |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | ablcom.b | |
|
2 | ablcom.p | |
|
3 | ablcmn | |
|
4 | 1 2 | cmncom | |
5 | 3 4 | syl3an1 | |