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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 4312 ordin 4532 relin2 4898 relres 5093 ssrnres 5233 cnvcnv 5243 funinsn 5433 funimaexg 5468 fnresin2 5502 ssimaex 5767 ffvresb 5874 fnfvimad 5957 ofrfval 6315 ofvalg 6316 ofrval 6317 off 6319 ofres 6321 ofco 6325 offres 6372 tpostpos 6539 smores3 6568 tfrlem5 6589 tfrexlem 6609 erinxp 6887 pmresg 6961 unfiin 7237 ltrelpi 7697 peano5nnnn 8265 peano5nni 9316 rexanuz 11776 bitsinv1 12754 structcnvcnv 13426 ressbasssd 13482 restsspw 13662 gsummptfidmsplit 14254 gsumresfi 14263 asplss 15125 eltg4i 15281 ntrss2 15347 ntrin 15350 isopn3 15351 resttopon 15397 restuni2 15403 cnrest2r 15463 cnptopresti 15464 cnptoprest 15465 lmss 15472 metrest 15732 tgioo 15780 2sqlem8 16447 2sqlem9 16448 peano5set 17171 |
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