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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 3402 | . . 3 ⊢ (𝑥 ∈ (𝐴 ∩ 𝐵) ↔ (𝑥 ∈ 𝐴 ∧ 𝑥 ∈ 𝐵)) | |
| 2 | 1 | simplbi 274 | . 2 ⊢ (𝑥 ∈ (𝐴 ∩ 𝐵) → 𝑥 ∈ 𝐴) |
| 3 | 2 | ssriv 3242 | 1 ⊢ (𝐴 ∩ 𝐵) ⊆ 𝐴 |
| Colors of variables: wff set class |
| Syntax hints: ∈ wcel 2203 ∩ cin 3210 ⊆ wss 3211 |
| 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 df-ss 3224 |
| This theorem is referenced by: inss2 3442 ssinss1 3450 unabs 3452 inssddif 3462 inv1 3545 disjdif 3581 inundifss 3587 relin1 4870 resss 5062 resmpt3 5087 cnvcnvss 5217 funin 5427 funimass2 5434 fnresin1 5473 fnres 5475 fresin 5543 ssimaex 5738 fneqeql2 5787 fnfvimad 5922 isoini2 5992 ofrfval 6275 ofvalg 6276 ofrval 6277 off 6279 ofres 6281 ofco 6285 smores 6523 smores2 6525 tfrlem5 6545 pmresg 6910 unfiin 7186 infidc 7201 sbthlem7 7233 peano5nnnn 8207 peano5nni 9240 hashfibclem 11206 rexanuz 11673 nninfdclemcl 13199 nninfdclemp1 13201 fvsetsid 13246 tgvalex 13476 tgval2 14916 eltg3 14922 tgcl 14929 tgdom 14937 tgidm 14939 epttop 14955 ntropn 14982 ntrin 14989 cnptopresti 15103 cnptoprest 15104 txcnmpt 15138 xmetres 15247 metres 15248 blin2 15297 metrest 15371 tgioo 15419 limcresi 15531 2sqlem8 15996 bj-charfun 16577 bj-charfundc 16578 bj-charfundcALT 16579 |
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