Description: Avoid axioms in base0 by using the discouraged df-base . This kind of axiom save is probably not worth it. (Contributed by SN, 16-Sep-2025) (Proof modification is discouraged.) (New usage is discouraged.)
| Ref | Expression | ||
|---|---|---|---|
| Assertion | sn-base0 | |- (/) = ( Base ` (/) ) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | df-base | |- Base = Slot 1 |
|
| 2 | 1 | str0 | |- (/) = ( Base ` (/) ) |