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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 2833 | . 2 ⊢ (𝐴 ∈ (𝐵 ∩ 𝐶) → 𝐴 ∈ V) | |
| 2 | elex 2833 | . . 3 ⊢ (𝐴 ∈ 𝐶 → 𝐴 ∈ V) | |
| 3 | 2 | adantl 277 | . 2 ⊢ ((𝐴 ∈ 𝐵 ∧ 𝐴 ∈ 𝐶) → 𝐴 ∈ V) |
| 4 | eleq1 2301 | . . . 4 ⊢ (𝑥 = 𝐴 → (𝑥 ∈ 𝐵 ↔ 𝐴 ∈ 𝐵)) | |
| 5 | eleq1 2301 | . . . 4 ⊢ (𝑥 = 𝐴 → (𝑥 ∈ 𝐶 ↔ 𝐴 ∈ 𝐶)) | |
| 6 | 4, 5 | anbi12d 477 | . . 3 ⊢ (𝑥 = 𝐴 → ((𝑥 ∈ 𝐵 ∧ 𝑥 ∈ 𝐶) ↔ (𝐴 ∈ 𝐵 ∧ 𝐴 ∈ 𝐶))) |
| 7 | df-in 3226 | . . 3 ⊢ (𝐵 ∩ 𝐶) = {𝑥 ∣ (𝑥 ∈ 𝐵 ∧ 𝑥 ∈ 𝐶)} | |
| 8 | 6, 7 | elab2g 2973 | . 2 ⊢ (𝐴 ∈ V → (𝐴 ∈ (𝐵 ∩ 𝐶) ↔ (𝐴 ∈ 𝐵 ∧ 𝐴 ∈ 𝐶))) |
| 9 | 1, 3, 8 | pm5.21nii 716 | 1 ⊢ (𝐴 ∈ (𝐵 ∩ 𝐶) ↔ (𝐴 ∈ 𝐵 ∧ 𝐴 ∈ 𝐶)) |
| Colors of variables: wff set class |
| Syntax hints: ∧ wa 104 ↔ wb 105 = wceq 1402 ∈ wcel 2209 Vcvv 2821 ∩ cin 3219 |
| 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 721 ax-5 1500 ax-7 1501 ax-gen 1502 ax-ie1 1546 ax-ie2 1547 ax-8 1557 ax-10 1558 ax-11 1559 ax-i12 1560 ax-bndl 1562 ax-4 1563 ax-17 1579 ax-i9 1583 ax-ial 1587 ax-i5r 1588 ax-ext 2220 |
| This theorem depends on definitions: df-bi 117 df-tru 1405 df-nf 1514 df-sb 1816 df-clab 2225 df-cleq 2231 df-clel 2234 df-nfc 2381 df-v 2823 df-in 3226 |
| This theorem is referenced by: elini 3413 elind 3414 elinel1 3415 elinel2 3416 elin2 3417 elin3 3420 incom 3421 ineqri 3424 ineq1 3425 inass 3441 inss1 3451 ssin 3453 ssrin 3456 dfss4st 3464 inssdif 3467 difin 3468 unssin 3470 inssun 3471 invdif 3473 indif 3474 indi 3478 undi 3479 difundi 3483 difindiss 3485 indifdir 3487 difin2 3493 inrab2 3506 inelcm 3584 inssdif0im 3591 uniin 3950 intun 3996 intpr 3997 elrint 4005 iunin2 4071 iinin2m 4076 elriin 4078 disjnim 4115 disjiun 4120 brin 4178 trin 4234 inex1 4262 inuni 4286 bnd2 4305 ordpwsucss 4709 ordpwsucexmid 4712 peano5 4740 inopab 4907 inxp 4909 dmin 4984 opelres 5063 intasym 5167 asymref 5168 dminss 5197 imainss 5198 inimasn 5200 ssrnres 5225 cnvresima 5272 dfco2a 5283 funinsn 5425 imainlem 5457 imain 5458 2elresin 5489 nfvres 5726 respreima 5827 isoini 6014 offval 6300 tfrlem5 6575 mapval2 6949 ixpin 6995 ssenen 7142 infidc 7238 fnfi 7240 elfpw 7252 peano5nnnn 8249 peano5nni 9286 ixxdisj 10284 icodisj 10373 fzdisj 10435 uzdisj 10478 nn0disj 10523 fzouzdisj 10567 sseqn 11257 hashfibclem 11260 isumss 12136 fsumsplit 12152 sumsplitdc 12177 fsum2dlemstep 12179 fprod2dlemstep 12367 bitsmod 12701 bitsinv1 12707 4sqlem12 13159 ballotfilem2 13206 ballotfilemth 13259 nninfdclemcl 13317 nninfdclemp1 13319 insubm 13769 isrhm 14438 subsubrng2 14496 subsubrg2 14527 2idlelb 14814 isbasis2g 15069 tgval2 15075 tgcl 15088 epttop 15114 ssntr 15146 ntreq0 15156 cnptopresti 15262 cnptoprest 15263 cnptoprest2 15264 lmss 15270 txcnp 15295 txcnmpt 15297 bldisj 15425 blininf 15448 blres 15458 metrest 15530 pilem1 15803 wlk1walkdom 16514 trlsegvdegfi 16622 bj-charfundcALT 16749 bj-charfunr 16750 bdinex1 16839 bj-indind 16872 |
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