Intuitionistic Logic Explorer |
< Previous
Next >
Nearby theorems |
||
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 1519 | . 2 | |
2 | 1 | nfi 1455 | 1 |
Copyright terms: Public domain | W3C validator |