Description: Existential specialization, using implicit substitution. (Contributed by Mario Carneiro, 4-Jan-2017)
Ref | Expression | ||
---|---|---|---|
Hypotheses | spcimgf.1 | |
|
spcimgf.2 | |
||
spcimegf.3 | |
||
Assertion | spcimegf | |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | spcimgf.1 | |
|
2 | spcimgf.2 | |
|
3 | spcimegf.3 | |
|
4 | 2 | nfn | |
5 | 3 | con3d | |
6 | 1 4 5 | spcimgf | |
7 | 6 | con2d | |
8 | df-ex | |
|
9 | 7 8 | syl6ibr | |