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Mirrors > Home > MPE Home > Th. List > nfxfr | Structured version Visualization version GIF version |
Description: A utility lemma to transfer a bound-variable hypothesis builder into a definition. (Contributed by Mario Carneiro, 11-Aug-2016.) |
Ref | Expression |
---|---|
nfbii.1 | ⊢ (𝜑 ↔ 𝜓) |
nfxfr.2 | ⊢ Ⅎ𝑥𝜓 |
Ref | Expression |
---|---|
nfxfr | ⊢ Ⅎ𝑥𝜑 |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | nfxfr.2 | . 2 ⊢ Ⅎ𝑥𝜓 | |
2 | nfbii.1 | . . 3 ⊢ (𝜑 ↔ 𝜓) | |
3 | 2 | nfbii 1859 | . 2 ⊢ (Ⅎ𝑥𝜑 ↔ Ⅎ𝑥𝜓) |
4 | 1, 3 | mpbir 234 | 1 ⊢ Ⅎ𝑥𝜑 |
Colors of variables: wff setvar class |
Syntax hints: ↔ wb 209 Ⅎwnf 1791 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1803 ax-4 1817 |
This theorem depends on definitions: df-bi 210 df-ex 1788 df-nf 1792 |
This theorem is referenced by: nfnan 1908 nf3an 1909 nfor 1912 nf3or 1913 nfa1 2154 nfnf1 2157 nfs1v 2159 nfa2 2176 nfan1 2200 nfs1f 2273 nfex 2325 nfnf 2327 nfsbv 2331 nfmo1 2556 nfeu1 2587 nfeu1ALT 2588 nfsab1 2723 nfnfc1 2900 nfnfc 2909 nfabdwOLD 2921 nfne 3032 nfnel 3043 nfra1 3130 nfra2w 3139 nfre1 3215 r19.12 3233 nfreu1 3272 nfrmo1 3273 nfrmow 3277 nfrmo 3279 nfss 3879 nfdisjw 5016 nfdisj 5017 nfdisj1 5018 nfpo 5458 nfso 5459 nffr 5510 nfse 5511 nfwe 5512 nfrel 5636 sb8iota 6328 nffun 6381 nffn 6456 nff 6519 nff1 6591 nffo 6610 nff1o 6637 nfiso 7109 tz7.49 8159 nfixpw 8575 nfixp 8576 bnj919 32413 bnj1379 32477 bnj571 32553 bnj607 32563 bnj873 32571 bnj981 32597 bnj1039 32618 bnj1128 32637 bnj1388 32680 bnj1398 32681 bnj1417 32688 bnj1444 32690 bnj1445 32691 bnj1446 32692 bnj1449 32695 bnj1467 32701 bnj1489 32703 bnj1312 32705 bnj1518 32711 bnj1525 32716 wl-nfae1 35372 wl-ax11-lem4 35425 ptrecube 35463 nfdfat 44234 nfich1 44515 nfich2 44516 ichnfimlem 44531 ich2ex 44536 |
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