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Mirrors > Home > NFE Home > Th. List > exbii | Unicode version |
Description: Inference adding existential quantifier to both sides of an equivalence. (Contributed by NM, 24-May-1994.) |
Ref | Expression |
---|---|
exbii.1 |
Ref | Expression |
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exbii |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | exbi 1581 | . 2 | |
2 | exbii.1 | . 2 | |
3 | 1, 2 | mpg 1548 | 1 |
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