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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 4550 | . 2 | |
2 | 1 | a1i 9 | 1 |
Colors of variables: wff set class |
Syntax hints: wi 4 cep 4264 wfr 4305 word 4339 |
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-io 699 ax-5 1435 ax-7 1436 ax-gen 1437 ax-ie1 1481 ax-ie2 1482 ax-8 1492 ax-10 1493 ax-11 1494 ax-i12 1495 ax-bndl 1497 ax-4 1498 ax-17 1514 ax-i9 1518 ax-ial 1522 ax-i5r 1523 ax-14 2139 ax-ext 2147 ax-sep 4099 ax-pow 4152 ax-pr 4186 ax-setind 4513 |
This theorem depends on definitions: df-bi 116 df-3an 970 df-tru 1346 df-nf 1449 df-sb 1751 df-eu 2017 df-mo 2018 df-clab 2152 df-cleq 2158 df-clel 2161 df-nfc 2296 df-ral 2448 df-v 2727 df-un 3119 df-in 3121 df-ss 3128 df-pw 3560 df-sn 3581 df-pr 3582 df-op 3584 df-br 3982 df-opab 4043 df-eprel 4266 df-frfor 4308 df-frind 4309 |
This theorem is referenced by: ordwe 4552 |
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