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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 5754 funimass4 5756 fconstfvm 5936 dfimafnf 5958 fliftel 6002 fliftf 6008 f1oiso 6035 releldm2 6423 frecabcl 6674 qsinxp 6889 qliftel 6893 supisolem 7354 enumctlemm 7460 ismkvnex 7501 genpassl 7897 genpassu 7898 addcomprg 7951 mulcomprg 7953 1idprl 7963 1idpru 7964 archrecnq 8036 archrecpr 8037 caucvgprprlemexbt 8079 caucvgprprlemexb 8080 archsr 8155 map2psrprg 8178 suplocsrlempr 8180 axsuploc 8404 cnegexlem3 8510 cnegex2 8512 recexre 8914 rerecclap 9068 creur 9297 creui 9298 nndiv 9354 arch 9571 nnrecl 9572 expnlbnd 11123 nn0sqdc 11168 fimaxq 11292 wrdval 11329 clim2 12074 clim2c 12075 clim0c 12077 climabs0 12098 climrecvg1n 12139 sumeq2 12150 mertensabs 12329 prodeq2 12349 zproddc 12371 nndivides 12589 alzdvds 12646 oddm1even 12667 oddnn02np1 12672 oddge22np1 12673 evennn02n 12674 evennn2n 12675 divalgb 12717 modremain 12721 modprmn0modprm0 13064 pythagtriplem2 13074 pythagtrip 13091 pceu 13103 4sqlem12 13210 ballotfilemsima 13317 mndpfo 13810 mndpropd 13812 grppropd 13881 conjnmzb 14142 dvdsr02 14521 crngunit 14527 dvdsrpropdg 14563 cnfldui 15033 znunit 15103 iscnp3 15429 lmbrf 15441 cncnp 15456 lmss 15472 metrest 15732 metcnp 15738 metcnp2 15739 txmetcnp 15744 cdivcncfap 15830 ivthdec 15870 bpos 16320 lgsquadlem2 16402 2lgslem1a 16412 pw1nct 17238 |
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