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Mirrors > Home > ILE Home > Th. List > ordfr | Unicode version |
Description: Epsilon is well-founded on an ordinal class. (Contributed by NM, 22-Apr-1994.) |
Ref | Expression |
---|---|
ordfr |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | zfregfr 4316 | . 2 | |
2 | 1 | a1i 9 | 1 |
Colors of variables: wff set class |
Syntax hints: wi 4 cep 4042 wfr 4083 word 4117 |
This theorem was proved from axioms: ax-1 5 ax-2 6 ax-mp 7 ax-ia1 104 ax-ia2 105 ax-ia3 106 ax-io 662 ax-5 1376 ax-7 1377 ax-gen 1378 ax-ie1 1422 ax-ie2 1423 ax-8 1435 ax-10 1436 ax-11 1437 ax-i12 1438 ax-bndl 1439 ax-4 1440 ax-14 1445 ax-17 1459 ax-i9 1463 ax-ial 1467 ax-i5r 1468 ax-ext 2063 ax-sep 3896 ax-pow 3948 ax-pr 3964 ax-setind 4280 |
This theorem depends on definitions: df-bi 115 df-3an 921 df-tru 1287 df-nf 1390 df-sb 1686 df-eu 1944 df-mo 1945 df-clab 2068 df-cleq 2074 df-clel 2077 df-nfc 2208 df-ral 2353 df-v 2603 df-un 2977 df-in 2979 df-ss 2986 df-pw 3384 df-sn 3404 df-pr 3405 df-op 3407 df-br 3786 df-opab 3840 df-eprel 4044 df-frfor 4086 df-frind 4087 |
This theorem is referenced by: ordwe 4318 |
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