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| Mirrors > Home > ILE Home > Th. List > elin | GIF version | ||
| Description: Expansion of membership in an intersection of two classes. Theorem 12 of [Suppes] p. 25. (Contributed by NM, 29-Apr-1994.) |
| Ref | Expression |
|---|---|
| elin | ⊢ (𝐴 ∈ (𝐵 ∩ 𝐶) ↔ (𝐴 ∈ 𝐵 ∧ 𝐴 ∈ 𝐶)) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | elex 2825 | . 2 ⊢ (𝐴 ∈ (𝐵 ∩ 𝐶) → 𝐴 ∈ V) | |
| 2 | elex 2825 | . . 3 ⊢ (𝐴 ∈ 𝐶 → 𝐴 ∈ V) | |
| 3 | 2 | adantl 277 | . 2 ⊢ ((𝐴 ∈ 𝐵 ∧ 𝐴 ∈ 𝐶) → 𝐴 ∈ V) |
| 4 | eleq1 2295 | . . . 4 ⊢ (𝑥 = 𝐴 → (𝑥 ∈ 𝐵 ↔ 𝐴 ∈ 𝐵)) | |
| 5 | eleq1 2295 | . . . 4 ⊢ (𝑥 = 𝐴 → (𝑥 ∈ 𝐶 ↔ 𝐴 ∈ 𝐶)) | |
| 6 | 4, 5 | anbi12d 473 | . . 3 ⊢ (𝑥 = 𝐴 → ((𝑥 ∈ 𝐵 ∧ 𝑥 ∈ 𝐶) ↔ (𝐴 ∈ 𝐵 ∧ 𝐴 ∈ 𝐶))) |
| 7 | df-in 3217 | . . 3 ⊢ (𝐵 ∩ 𝐶) = {𝑥 ∣ (𝑥 ∈ 𝐵 ∧ 𝑥 ∈ 𝐶)} | |
| 8 | 6, 7 | elab2g 2964 | . 2 ⊢ (𝐴 ∈ V → (𝐴 ∈ (𝐵 ∩ 𝐶) ↔ (𝐴 ∈ 𝐵 ∧ 𝐴 ∈ 𝐶))) |
| 9 | 1, 3, 8 | pm5.21nii 712 | 1 ⊢ (𝐴 ∈ (𝐵 ∩ 𝐶) ↔ (𝐴 ∈ 𝐵 ∧ 𝐴 ∈ 𝐶)) |
| Colors of variables: wff set class |
| Syntax hints: ∧ wa 104 ↔ wb 105 = wceq 1398 ∈ wcel 2203 Vcvv 2813 ∩ cin 3210 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-ia1 106 ax-ia2 107 ax-ia3 108 ax-io 717 ax-5 1496 ax-7 1497 ax-gen 1498 ax-ie1 1542 ax-ie2 1543 ax-8 1553 ax-10 1554 ax-11 1555 ax-i12 1556 ax-bndl 1558 ax-4 1559 ax-17 1575 ax-i9 1579 ax-ial 1583 ax-i5r 1584 ax-ext 2214 |
| This theorem depends on definitions: df-bi 117 df-tru 1401 df-nf 1510 df-sb 1812 df-clab 2219 df-cleq 2225 df-clel 2228 df-nfc 2373 df-v 2815 df-in 3217 |
| This theorem is referenced by: elini 3403 elind 3404 elinel1 3405 elinel2 3406 elin2 3407 elin3 3410 incom 3411 ineqri 3414 ineq1 3415 inass 3431 inss1 3441 ssin 3443 ssrin 3446 dfss4st 3454 inssdif 3457 difin 3458 unssin 3460 inssun 3461 invdif 3463 indif 3464 indi 3468 undi 3469 difundi 3473 difindiss 3475 indifdir 3477 difin2 3483 inrab2 3494 inelcm 3569 inssdif0im 3576 uniin 3934 intun 3980 intpr 3981 elrint 3989 iunin2 4055 iinin2m 4060 elriin 4062 disjnim 4099 disjiun 4104 brin 4162 trin 4218 inex1 4244 inuni 4267 bnd2 4286 ordpwsucss 4689 ordpwsucexmid 4692 peano5 4720 inopab 4887 inxp 4889 dmin 4964 opelres 5043 intasym 5147 asymref 5148 dminss 5177 imainss 5178 inimasn 5180 ssrnres 5205 cnvresima 5252 dfco2a 5263 funinsn 5405 imainlem 5437 imain 5438 2elresin 5469 nfvres 5706 respreima 5805 isoini 5991 offval 6274 tfrlem5 6545 mapval2 6912 ixpin 6958 ssenen 7105 infidc 7201 fnfi 7203 elfpw 7215 peano5nnnn 8207 peano5nni 9240 ixxdisj 10236 icodisj 10325 fzdisj 10386 uzdisj 10427 nn0disj 10472 fzouzdisj 10516 sseqn 11203 hashfibclem 11206 isumss 12077 fsumsplit 12093 sumsplitdc 12118 fsum2dlemstep 12120 fprod2dlemstep 12308 bitsmod 12642 bitsinv1 12648 4sqlem12 13100 ballotfilem2 13142 nninfdclemcl 13199 nninfdclemp1 13201 insubm 13698 isrhm 14303 subsubrng2 14360 subsubrg2 14391 2idlelb 14653 isbasis2g 14910 tgval2 14916 tgcl 14929 epttop 14955 ssntr 14987 ntreq0 14997 cnptopresti 15103 cnptoprest 15104 cnptoprest2 15105 lmss 15111 txcnp 15136 txcnmpt 15138 bldisj 15266 blininf 15289 blres 15299 metrest 15371 pilem1 15644 wlk1walkdom 16354 trlsegvdegfi 16462 bj-charfundcALT 16579 bj-charfunr 16580 bdinex1 16669 bj-indind 16702 |
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