Description: Restricted existential specialization, using implicit substitution. (Contributed by Mario Carneiro, 4-Jan-2017)
Ref | Expression | ||
---|---|---|---|
Hypotheses | rspcimdv.1 | |
|
rspcimedv.2 | |
||
Assertion | rspcimedv | |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | rspcimdv.1 | |
|
2 | rspcimedv.2 | |
|
3 | 2 | con3d | |
4 | 1 3 | rspcimdv | |
5 | 4 | con2d | |
6 | dfrex2 | |
|
7 | 5 6 | syl6ibr | |