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Mirrors > Home > MPE Home > Th. List > nfcv | Structured version Visualization version GIF version |
Description: If 𝑥 is disjoint from 𝐴, then 𝑥 is not free in 𝐴. (Contributed by Mario Carneiro, 11-Aug-2016.) |
Ref | Expression |
---|---|
nfcv | ⊢ Ⅎ𝑥𝐴 |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | nfv 1918 | . 2 ⊢ Ⅎ𝑥 𝑦 ∈ 𝐴 | |
2 | 1 | nfci 2891 | 1 ⊢ Ⅎ𝑥𝐴 |
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