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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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