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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 1848 | . 2 ⊢ (Ⅎ𝑥𝜑 ↔ Ⅎ𝑥𝜓) |
4 | 1, 3 | mpbir 233 | 1 ⊢ Ⅎ𝑥𝜑 |
Colors of variables: wff setvar class |
Syntax hints: ↔ wb 208 Ⅎwnf 1780 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1792 ax-4 1806 |
This theorem depends on definitions: df-bi 209 df-ex 1777 df-nf 1781 |
This theorem is referenced by: nfnan 1897 nf3an 1898 nfor 1901 nf3or 1902 nfa1 2151 nfnf1 2154 nfs1v 2156 nfa2 2172 nfan1 2196 nfs1f 2271 nfex 2339 nfnf 2341 nfsbv 2345 nfsbvOLD 2346 nfmo1 2637 nfeu1 2670 nfeu1ALT 2671 nfsab1 2808 nfnfc1 2980 nfnfc 2990 nfabdw 3000 nfne 3119 nfnel 3130 nfra1 3219 nfre1 3306 r19.12 3324 nfreu1 3370 nfrmo1 3371 nfrmow 3375 nfrmo 3377 nfss 3959 nfdisjw 5035 nfdisj 5036 nfdisj1 5037 nfpo 5473 nfso 5474 nffr 5523 nfse 5524 nfwe 5525 nfrel 5648 sb8iota 6319 nffun 6372 nffn 6446 nff 6504 nff1 6567 nffo 6583 nff1o 6607 nfiso 7069 tz7.49 8075 nfixpw 8474 nfixp 8475 bnj919 32033 bnj1379 32097 bnj571 32173 bnj607 32183 bnj873 32191 bnj981 32217 bnj1039 32238 bnj1128 32257 bnj1388 32300 bnj1398 32301 bnj1417 32308 bnj1444 32310 bnj1445 32311 bnj1446 32312 bnj1449 32315 bnj1467 32321 bnj1489 32323 bnj1312 32325 bnj1518 32331 bnj1525 32336 wl-nfae1 34761 wl-ax11-lem4 34814 ptrecube 34886 nfdfat 43320 nfich1 43601 nfich2 43602 ich2ex 43623 |
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