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Mirrors > Home > ILE Home > Th. List > 19.21bbi | Unicode version |
Description: Inference removing double quantifier. (Contributed by NM, 20-Apr-1994.) |
Ref | Expression |
---|---|
19.21bbi.1 |
Ref | Expression |
---|---|
19.21bbi |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | 19.21bbi.1 | . . 3 | |
2 | 1 | 19.21bi 1490 | . 2 |
3 | 2 | 19.21bi 1490 | 1 |
Colors of variables: wff set class |
Syntax hints: wi 4 wal 1282 |
This theorem was proved from axioms: ax-1 5 ax-2 6 ax-mp 7 ax-4 1440 |
This theorem is referenced by: pocl 4058 funun 4964 fununi 4987 imain 5001 |
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