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| Mirrors > Home > ILE Home > Th. List > rexbii | Unicode version | ||
| Description: Inference adding restricted existential quantifier to both sides of an equivalence. (Contributed by NM, 23-Nov-1994.) (Revised by Mario Carneiro, 17-Oct-2016.) |
| Ref | Expression |
|---|---|
| ralbii.1 |
|
| Ref | Expression |
|---|---|
| rexbii |
|
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | ralbii.1 |
. . . 4
| |
| 2 | 1 | a1i 9 |
. . 3
|
| 3 | 2 | rexbidv 2498 |
. 2
|
| 4 | 3 | mptru 1373 |
1
|
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