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Mirrors > Home > MPE Home > Th. List > nfrab1 | Structured version Visualization version Unicode version |
Description: The abstraction variable in a restricted class abstraction isn't free. (Contributed by NM, 19-Mar-1997.) |
Ref | Expression |
---|---|
nfrab1 |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | df-rab 2921 | . 2 | |
2 | nfab1 2766 | . 2 | |
3 | 1, 2 | nfcxfr 2762 | 1 |
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