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Mirrors > Home > ILE Home > Th. List > nfreu1 | Unicode version |
Description: is not free in . (Contributed by NM, 19-Mar-1997.) |
Ref | Expression |
---|---|
nfreu1 |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | df-reu 2400 | . 2 | |
2 | nfeu1 1988 | . 2 | |
3 | 1, 2 | nfxfr 1435 | 1 |
Colors of variables: wff set class |
Syntax hints: wa 103 wnf 1421 wcel 1465 weu 1977 wreu 2395 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-ia1 105 ax-ia2 106 ax-ia3 107 ax-5 1408 ax-7 1409 ax-gen 1410 ax-ie1 1454 ax-ie2 1455 ax-4 1472 ax-ial 1499 |
This theorem depends on definitions: df-bi 116 df-nf 1422 df-eu 1980 df-reu 2400 |
This theorem is referenced by: riota2df 5718 |
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