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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 |
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Ref | Expression |
---|---|
rexbii |
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Step | Hyp | Ref | Expression |
---|---|---|---|
1 | ralbii.1 |
. . . 4
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2 | 1 | a1i 9 |
. . 3
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3 | 2 | rexbidv 2476 |
. 2
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4 | 3 | mptru 1362 |
1
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