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| Mirrors > Home > ILE Home > Th. List > rexbidva | GIF version | ||
| Description: Formula-building rule for restricted existential quantifier (deduction form). (Contributed by NM, 9-Mar-1997.) |
| Ref | Expression |
|---|---|
| ralbidva.1 | ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐴) → (𝜓 ↔ 𝜒)) |
| Ref | Expression |
|---|---|
| rexbidva | ⊢ (𝜑 → (∃𝑥 ∈ 𝐴 𝜓 ↔ ∃𝑥 ∈ 𝐴 𝜒)) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | nfv 1581 | . 2 ⊢ Ⅎ𝑥𝜑 | |
| 2 | ralbidva.1 | . 2 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐴) → (𝜓 ↔ 𝜒)) | |
| 3 | 1, 2 | rexbida 2545 | 1 ⊢ (𝜑 → (∃𝑥 ∈ 𝐴 𝜓 ↔ ∃𝑥 ∈ 𝐴 𝜒)) |
| Colors of variables: wff set class |
| This proof depends on syntax axioms: → wi 4 ∧ wa 104 ↔ wb 105 ∈ wcel 2209 ∃wrex 2529 |
| This proof depends on axioms: ax-mp 5 ax-1 6 ax-2 7 ax-ia1 106 ax-ia2 107 ax-ia3 108 ax-5 1500 ax-gen 1502 ax-ie1 1546 ax-ie2 1547 ax-4 1563 ax-17 1579 ax-ial 1587 |
| This proof depends on definitions: df-bi 117 df-nf 1514 df-rex 2534 |
| This theorem is used by: 2rexbiia 2566 2rexbidva 2573 rexeqbidva 2768 dfimafn 5751 funimass4 5753 fconstfvm 5933 dfimafnf 5955 fliftel 5999 fliftf 6005 f1oiso 6032 releldm2 6419 frecabcl 6670 qsinxp 6885 qliftel 6889 supisolem 7348 enumctlemm 7454 ismkvnex 7495 genpassl 7891 genpassu 7892 addcomprg 7945 mulcomprg 7947 1idprl 7957 1idpru 7958 archrecnq 8030 archrecpr 8031 caucvgprprlemexbt 8073 caucvgprprlemexb 8074 archsr 8149 map2psrprg 8172 suplocsrlempr 8174 axsuploc 8398 cnegexlem3 8504 cnegex2 8506 recexre 8908 rerecclap 9062 creur 9291 creui 9292 nndiv 9347 arch 9564 nnrecl 9565 expnlbnd 11115 nn0sqdc 11160 fimaxq 11284 wrdval 11321 clim2 12065 clim2c 12066 clim0c 12068 climabs0 12089 climrecvg1n 12130 sumeq2 12141 mertensabs 12320 prodeq2 12340 zproddc 12362 nndivides 12580 alzdvds 12637 oddm1even 12658 oddnn02np1 12663 oddge22np1 12664 evennn02n 12665 evennn2n 12666 divalgb 12708 modremain 12712 modprmn0modprm0 13055 pythagtriplem2 13065 pythagtrip 13082 pceu 13094 4sqlem12 13201 ballotfilemsima 13308 mndpfo 13800 mndpropd 13802 grppropd 13871 conjnmzb 14132 dvdsr02 14461 crngunit 14467 dvdsrpropdg 14503 cnfldui 14973 znunit 15043 iscnp3 15353 lmbrf 15365 cncnp 15380 lmss 15396 metrest 15656 metcnp 15662 metcnp2 15663 txmetcnp 15668 cdivcncfap 15754 ivthdec 15794 lgsquadlem2 16295 2lgslem1a 16305 pw1nct 17131 |
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