Description: Define group operation. (Contributed by NM, 4-Sep-2011) (Revised by Mario Carneiro, 14-Aug-2015) Use its index-independent form plusgid instead. (New usage is discouraged.)
| Ref | Expression | ||
|---|---|---|---|
| Assertion | df-plusg | |- +g = Slot 2 |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 0 | cplusg | |- +g |
|
| 1 | c2 | |- 2 |
|
| 2 | 1 | cslot | |- Slot 2 |
| 3 | 0 2 | wceq | |- +g = Slot 2 |