Description: Define the involution function of a *-ring. (Contributed by NM, 4-Sep-2011) (Revised by Mario Carneiro, 14-Aug-2015) Use its index-independent form starvid instead. (New usage is discouraged.)
| Ref | Expression | ||
|---|---|---|---|
| Assertion | df-starv | |- *r = Slot 4 |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 0 | cstv | |- *r |
|
| 1 | c4 | |- 4 |
|
| 2 | 1 | cslot | |- Slot 4 |
| 3 | 0 2 | wceq | |- *r = Slot 4 |