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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 2827 | . 2 ⊢ (𝐴 ∈ (𝐵 ∩ 𝐶) → 𝐴 ∈ V) | |
| 2 | elex 2827 | . . 3 ⊢ (𝐴 ∈ 𝐶 → 𝐴 ∈ V) | |
| 3 | 2 | adantl 277 | . 2 ⊢ ((𝐴 ∈ 𝐵 ∧ 𝐴 ∈ 𝐶) → 𝐴 ∈ V) |
| 4 | eleq1 2297 | . . . 4 ⊢ (𝑥 = 𝐴 → (𝑥 ∈ 𝐵 ↔ 𝐴 ∈ 𝐵)) | |
| 5 | eleq1 2297 | . . . 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 3220 | . . 3 ⊢ (𝐵 ∩ 𝐶) = {𝑥 ∣ (𝑥 ∈ 𝐵 ∧ 𝑥 ∈ 𝐶)} | |
| 8 | 6, 7 | elab2g 2967 | . 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 2205 Vcvv 2815 ∩ cin 3213 |
| 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 2216 |
| This theorem depends on definitions: df-bi 117 df-tru 1401 df-nf 1510 df-sb 1812 df-clab 2221 df-cleq 2227 df-clel 2230 df-nfc 2375 df-v 2817 df-in 3220 |
| This theorem is referenced by: elini 3407 elind 3408 elinel1 3409 elinel2 3410 elin2 3411 elin3 3414 incom 3415 ineqri 3418 ineq1 3419 inass 3435 inss1 3445 ssin 3447 ssrin 3450 dfss4st 3458 inssdif 3461 difin 3462 unssin 3464 inssun 3465 invdif 3467 indif 3468 indi 3472 undi 3473 difundi 3477 difindiss 3479 indifdir 3481 difin2 3487 inrab2 3498 inelcm 3573 inssdif0im 3580 uniin 3939 intun 3985 intpr 3986 elrint 3994 iunin2 4060 iinin2m 4065 elriin 4067 disjnim 4104 disjiun 4109 brin 4167 trin 4223 inex1 4249 inuni 4272 bnd2 4291 ordpwsucss 4694 ordpwsucexmid 4697 peano5 4725 inopab 4892 inxp 4894 dmin 4969 opelres 5048 intasym 5152 asymref 5153 dminss 5182 imainss 5183 inimasn 5185 ssrnres 5210 cnvresima 5257 dfco2a 5268 funinsn 5410 imainlem 5442 imain 5443 2elresin 5474 nfvres 5711 respreima 5810 isoini 5997 offval 6283 tfrlem5 6558 mapval2 6925 ixpin 6971 ssenen 7118 infidc 7214 fnfi 7216 elfpw 7228 peano5nnnn 8223 peano5nni 9257 ixxdisj 10255 icodisj 10344 fzdisj 10406 uzdisj 10449 nn0disj 10494 fzouzdisj 10538 sseqn 11228 hashfibclem 11231 isumss 12102 fsumsplit 12118 sumsplitdc 12143 fsum2dlemstep 12145 fprod2dlemstep 12333 bitsmod 12667 bitsinv1 12673 4sqlem12 13125 ballotfilem2 13172 ballotfilemth 13225 nninfdclemcl 13283 nninfdclemp1 13285 insubm 13740 isrhm 14403 subsubrng2 14461 subsubrg2 14492 2idlelb 14779 isbasis2g 15036 tgval2 15042 tgcl 15055 epttop 15081 ssntr 15113 ntreq0 15123 cnptopresti 15229 cnptoprest 15230 cnptoprest2 15231 lmss 15237 txcnp 15262 txcnmpt 15264 bldisj 15392 blininf 15415 blres 15425 metrest 15497 pilem1 15770 wlk1walkdom 16480 trlsegvdegfi 16588 bj-charfundcALT 16705 bj-charfunr 16706 bdinex1 16795 bj-indind 16828 |
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