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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 3390 | . . 3 ⊢ (𝑥 ∈ (𝐴 ∩ 𝐵) ↔ (𝑥 ∈ 𝐴 ∧ 𝑥 ∈ 𝐵)) | |
| 2 | 1 | simplbi 274 | . 2 ⊢ (𝑥 ∈ (𝐴 ∩ 𝐵) → 𝑥 ∈ 𝐴) |
| 3 | 2 | ssriv 3231 | 1 ⊢ (𝐴 ∩ 𝐵) ⊆ 𝐴 |
| Colors of variables: wff set class |
| Syntax hints: ∈ wcel 2202 ∩ cin 3199 ⊆ wss 3200 |
| 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 716 ax-5 1495 ax-7 1496 ax-gen 1497 ax-ie1 1541 ax-ie2 1542 ax-8 1552 ax-10 1553 ax-11 1554 ax-i12 1555 ax-bndl 1557 ax-4 1558 ax-17 1574 ax-i9 1578 ax-ial 1582 ax-i5r 1583 ax-ext 2213 |
| This theorem depends on definitions: df-bi 117 df-tru 1400 df-nf 1509 df-sb 1811 df-clab 2218 df-cleq 2224 df-clel 2227 df-nfc 2363 df-v 2804 df-in 3206 df-ss 3213 |
| This theorem is referenced by: inss2 3428 ssinss1 3436 unabs 3438 inssddif 3448 inv1 3531 disjdif 3567 inundifss 3572 relin1 4845 resss 5037 resmpt3 5062 cnvcnvss 5191 funin 5401 funimass2 5408 fnresin1 5447 fnres 5449 fresin 5515 ssimaex 5707 fneqeql2 5756 fnfvimad 5889 isoini2 5959 ofrfval 6243 ofvalg 6244 ofrval 6245 off 6247 ofres 6249 ofco 6253 smores 6457 smores2 6459 tfrlem5 6479 pmresg 6844 unfiin 7117 infidc 7132 sbthlem7 7161 peano5nnnn 8111 peano5nni 9145 rexanuz 11548 nninfdclemcl 13068 nninfdclemp1 13070 fvsetsid 13115 tgvalex 13345 tgval2 14774 eltg3 14780 tgcl 14787 tgdom 14795 tgidm 14797 epttop 14813 ntropn 14840 ntrin 14847 cnptopresti 14961 cnptoprest 14962 txcnmpt 14996 xmetres 15105 metres 15106 blin2 15155 metrest 15229 tgioo 15277 limcresi 15389 2sqlem8 15851 bj-charfun 16402 bj-charfundc 16403 bj-charfundcALT 16404 |
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