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| Mirrors > Home > ILE Home > Th. List > inss2 | 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 |
|---|---|
| inss2 | ⊢ (𝐴 ∩ 𝐵) ⊆ 𝐵 |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | incom 3421 | . 2 ⊢ (𝐵 ∩ 𝐴) = (𝐴 ∩ 𝐵) | |
| 2 | inss1 3451 | . 2 ⊢ (𝐵 ∩ 𝐴) ⊆ 𝐵 | |
| 3 | 1, 2 | eqsstrri 3281 | 1 ⊢ (𝐴 ∩ 𝐵) ⊆ 𝐵 |
| Colors of variables: wff set class |
| This proof depends on syntax axioms: ∩ cin 3219 ⊆ wss 3220 |
| This proof depends on axioms: ax-mp 5 ax-1 6 ax-2 7 ax-ia1 106 ax-ia2 107 ax-ia3 108 ax-io 721 ax-5 1500 ax-7 1501 ax-gen 1502 ax-ie1 1546 ax-ie2 1547 ax-8 1557 ax-10 1558 ax-11 1559 ax-i12 1560 ax-bndl 1562 ax-4 1563 ax-17 1579 ax-i9 1583 ax-ial 1587 ax-i5r 1588 ax-ext 2220 |
| This proof depends on definitions: df-bi 117 df-tru 1405 df-nf 1514 df-sb 1816 df-clab 2225 df-cleq 2231 df-clel 2234 df-nfc 2381 df-v 2823 df-in 3226 df-ss 3233 |
| This theorem is used by: vvin 3569 difin0 3601 bnd2 4310 ordin 4530 relin2 4896 relres 5091 ssrnres 5230 cnvcnv 5240 funinsn 5430 funimaexg 5465 fnresin2 5499 ssimaex 5764 ffvresb 5871 fnfvimad 5954 ofrfval 6311 ofvalg 6312 ofrval 6313 off 6315 ofres 6317 ofco 6321 offres 6368 tpostpos 6535 smores3 6564 tfrlem5 6585 tfrexlem 6605 erinxp 6883 pmresg 6957 unfiin 7233 ltrelpi 7691 peano5nnnn 8259 peano5nni 9307 rexanuz 11754 bitsinv1 12729 structcnvcnv 13368 ressbasssd 13423 restsspw 13603 asplss 15016 eltg4i 15156 ntrss2 15222 ntrin 15225 isopn3 15226 resttopon 15272 restuni2 15278 cnrest2r 15338 cnptopresti 15339 cnptoprest 15340 lmss 15347 metrest 15607 tgioo 15655 2sqlem8 16242 2sqlem9 16243 peano5set 16966 |
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