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Mirrors > Home > ILE Home > Th. List > exbi | Unicode version |
Description: Theorem 19.18 of [Margaris] p. 90. (Contributed by NM, 5-Aug-1993.) |
Ref | Expression |
---|---|
exbi |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | bi1 117 | . . . 4 | |
2 | 1 | alimi 1431 | . . 3 |
3 | exim 1578 | . . 3 | |
4 | 2, 3 | syl 14 | . 2 |
5 | bi2 129 | . . . 4 | |
6 | 5 | alimi 1431 | . . 3 |
7 | exim 1578 | . . 3 | |
8 | 6, 7 | syl 14 | . 2 |
9 | 4, 8 | impbid 128 | 1 |
Colors of variables: wff set class |
Syntax hints: wi 4 wb 104 wal 1329 wex 1468 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-ia1 105 ax-ia2 106 ax-ia3 107 ax-5 1423 ax-gen 1425 ax-ie1 1469 ax-ie2 1470 ax-4 1487 ax-ial 1514 |
This theorem depends on definitions: df-bi 116 |
This theorem is referenced by: exbii 1584 exbidh 1593 exintrbi 1612 19.19 1644 rexrnmpt 5563 |
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