Description: Introduction of conjunct inside of a contradiction. Would be used in elfvov1 . (Contributed by SN, 18-May-2025)
Ref | Expression | ||
---|---|---|---|
Assertion | intnanrt | |- ( -. ph -> -. ( ph /\ ps ) ) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | simpl | |- ( ( ph /\ ps ) -> ph ) |
|
2 | 1 | con3i | |- ( -. ph -> -. ( ph /\ ps ) ) |