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Mirrors > Home > ILE Home > Th. List > nfv | Unicode version |
Description: If is not present in , then is not free in . (Contributed by Mario Carneiro, 11-Aug-2016.) |
Ref | Expression |
---|---|
nfv |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | ax-17 1513 | . 2 | |
2 | 1 | nfi 1449 | 1 |
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