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| Description: Formula-building rule for restricted existential quantifier (deduction rule). |
| Ref | Expression |
|---|---|
| ralbidv.1 |
|
| Ref | Expression |
|---|---|
| rexbidv |
|
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | ax-17 973 |
. 2
| |
| 2 | ralbidv.1 |
. 2
| |
| 3 | 1, 2 | rexbid 1665 |
1
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