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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 3392 | . . 3 ⊢ (𝑥 ∈ (𝐴 ∩ 𝐵) ↔ (𝑥 ∈ 𝐴 ∧ 𝑥 ∈ 𝐵)) | |
| 2 | 1 | simplbi 274 | . 2 ⊢ (𝑥 ∈ (𝐴 ∩ 𝐵) → 𝑥 ∈ 𝐴) |
| 3 | 2 | ssriv 3232 | 1 ⊢ (𝐴 ∩ 𝐵) ⊆ 𝐴 |
| Colors of variables: wff set class |
| Syntax hints: ∈ wcel 2202 ∩ cin 3200 ⊆ wss 3201 |
| 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 2213 |
| This theorem depends on definitions: df-bi 117 df-tru 1401 df-nf 1510 df-sb 1811 df-clab 2218 df-cleq 2224 df-clel 2227 df-nfc 2364 df-v 2805 df-in 3207 df-ss 3214 |
| This theorem is referenced by: inss2 3430 ssinss1 3438 unabs 3440 inssddif 3450 inv1 3533 disjdif 3569 inundifss 3574 relin1 4851 resss 5043 resmpt3 5068 cnvcnvss 5198 funin 5408 funimass2 5415 fnresin1 5454 fnres 5456 fresin 5523 ssimaex 5716 fneqeql2 5765 fnfvimad 5900 isoini2 5970 ofrfval 6253 ofvalg 6254 ofrval 6255 off 6257 ofres 6259 ofco 6263 smores 6501 smores2 6503 tfrlem5 6523 pmresg 6888 unfiin 7161 infidc 7176 sbthlem7 7205 peano5nnnn 8155 peano5nni 9188 rexanuz 11611 nninfdclemcl 13132 nninfdclemp1 13134 fvsetsid 13179 tgvalex 13409 tgval2 14845 eltg3 14851 tgcl 14858 tgdom 14866 tgidm 14868 epttop 14884 ntropn 14911 ntrin 14918 cnptopresti 15032 cnptoprest 15033 txcnmpt 15067 xmetres 15176 metres 15177 blin2 15226 metrest 15300 tgioo 15348 limcresi 15460 2sqlem8 15925 bj-charfun 16506 bj-charfundc 16507 bj-charfundcALT 16508 |
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