Description: Formula-building rule for four existential quantifiers (deduction form). (Contributed by NM, 3-Aug-1995)
Ref | Expression | ||
---|---|---|---|
Hypothesis | 4exbidv.1 | |
|
Assertion | 4exbidv | |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | 4exbidv.1 | |
|
2 | 1 | 2exbidv | |
3 | 2 | 2exbidv | |