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| Mirrors > Home > ILE Home > Th. List > inss1 | GIF version | ||
| Description: The intersection of two classes is a subset of one of them. Part of Exercise 12 of [TakeutiZaring] p. 18. (Contributed by NM, 27-Apr-1994.) |
| Ref | Expression |
|---|---|
| inss1 | ⊢ (𝐴 ∩ 𝐵) ⊆ 𝐴 |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | elin 3388 | . . 3 ⊢ (𝑥 ∈ (𝐴 ∩ 𝐵) ↔ (𝑥 ∈ 𝐴 ∧ 𝑥 ∈ 𝐵)) | |
| 2 | 1 | simplbi 274 | . 2 ⊢ (𝑥 ∈ (𝐴 ∩ 𝐵) → 𝑥 ∈ 𝐴) |
| 3 | 2 | ssriv 3229 | 1 ⊢ (𝐴 ∩ 𝐵) ⊆ 𝐴 |
| Colors of variables: wff set class |
| Syntax hints: ∈ wcel 2200 ∩ cin 3197 ⊆ wss 3198 |
| 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 714 ax-5 1493 ax-7 1494 ax-gen 1495 ax-ie1 1539 ax-ie2 1540 ax-8 1550 ax-10 1551 ax-11 1552 ax-i12 1553 ax-bndl 1555 ax-4 1556 ax-17 1572 ax-i9 1576 ax-ial 1580 ax-i5r 1581 ax-ext 2211 |
| This theorem depends on definitions: df-bi 117 df-tru 1398 df-nf 1507 df-sb 1809 df-clab 2216 df-cleq 2222 df-clel 2225 df-nfc 2361 df-v 2802 df-in 3204 df-ss 3211 |
| This theorem is referenced by: inss2 3426 ssinss1 3434 unabs 3436 inssddif 3446 inv1 3529 disjdif 3565 inundifss 3570 relin1 4843 resss 5035 resmpt3 5060 cnvcnvss 5189 funin 5398 funimass2 5405 fnresin1 5444 fnres 5446 fresin 5512 ssimaex 5703 fneqeql2 5752 fnfvimad 5885 isoini2 5955 ofrfval 6239 ofvalg 6240 ofrval 6241 off 6243 ofres 6245 ofco 6249 smores 6453 smores2 6455 tfrlem5 6475 pmresg 6840 unfiin 7111 infidc 7124 sbthlem7 7153 peano5nnnn 8102 peano5nni 9136 rexanuz 11539 nninfdclemcl 13059 nninfdclemp1 13061 fvsetsid 13106 tgvalex 13336 tgval2 14765 eltg3 14771 tgcl 14778 tgdom 14786 tgidm 14788 epttop 14804 ntropn 14831 ntrin 14838 cnptopresti 14952 cnptoprest 14953 txcnmpt 14987 xmetres 15096 metres 15097 blin2 15146 metrest 15220 tgioo 15268 limcresi 15380 2sqlem8 15842 bj-charfun 16338 bj-charfundc 16339 bj-charfundcALT 16340 |
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