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Mirrors > Home > MPE Home > Th. List > ssdif0 | Structured version Visualization version GIF version |
Description: Subclass expressed in terms of difference. Exercise 7 of [TakeutiZaring] p. 22. (Contributed by NM, 29-Apr-1994.) |
Ref | Expression |
---|---|
ssdif0 | ⊢ (𝐴 ⊆ 𝐵 ↔ (𝐴 ∖ 𝐵) = ∅) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | iman 439 | . . . 4 ⊢ ((𝑥 ∈ 𝐴 → 𝑥 ∈ 𝐵) ↔ ¬ (𝑥 ∈ 𝐴 ∧ ¬ 𝑥 ∈ 𝐵)) | |
2 | eldif 3550 | . . . 4 ⊢ (𝑥 ∈ (𝐴 ∖ 𝐵) ↔ (𝑥 ∈ 𝐴 ∧ ¬ 𝑥 ∈ 𝐵)) | |
3 | 1, 2 | xchbinxr 324 | . . 3 ⊢ ((𝑥 ∈ 𝐴 → 𝑥 ∈ 𝐵) ↔ ¬ 𝑥 ∈ (𝐴 ∖ 𝐵)) |
4 | 3 | albii 1737 | . 2 ⊢ (∀𝑥(𝑥 ∈ 𝐴 → 𝑥 ∈ 𝐵) ↔ ∀𝑥 ¬ 𝑥 ∈ (𝐴 ∖ 𝐵)) |
5 | dfss2 3557 | . 2 ⊢ (𝐴 ⊆ 𝐵 ↔ ∀𝑥(𝑥 ∈ 𝐴 → 𝑥 ∈ 𝐵)) | |
6 | eq0 3888 | . 2 ⊢ ((𝐴 ∖ 𝐵) = ∅ ↔ ∀𝑥 ¬ 𝑥 ∈ (𝐴 ∖ 𝐵)) | |
7 | 4, 5, 6 | 3bitr4i 291 | 1 ⊢ (𝐴 ⊆ 𝐵 ↔ (𝐴 ∖ 𝐵) = ∅) |
Colors of variables: wff setvar class |
Syntax hints: ¬ wn 3 → wi 4 ↔ wb 195 ∧ wa 383 ∀wal 1473 = wceq 1475 ∈ wcel 1977 ∖ cdif 3537 ⊆ wss 3540 ∅c0 3874 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1713 ax-4 1728 ax-5 1827 ax-6 1875 ax-7 1922 ax-10 2006 ax-11 2021 ax-12 2034 ax-13 2234 ax-ext 2590 |
This theorem depends on definitions: df-bi 196 df-or 384 df-an 385 df-tru 1478 df-ex 1696 df-nf 1701 df-sb 1868 df-clab 2597 df-cleq 2603 df-clel 2606 df-nfc 2740 df-v 3175 df-dif 3543 df-in 3547 df-ss 3554 df-nul 3875 |
This theorem is referenced by: difn0 3897 pssdifn0 3898 difid 3902 vdif0 3989 difrab0eq 3990 difin0 3993 symdifv 4534 wfi 5630 ordintdif 5691 dffv2 6181 fndifnfp 6347 tfi 6945 peano5 6981 wfrlem8 7309 wfrlem16 7317 tz7.49 7427 oe0m1 7488 sdomdif 7993 php3 8031 sucdom2 8041 isinf 8058 unxpwdom2 8376 fin23lem26 9030 fin23lem21 9044 fin1a2lem13 9117 zornn0g 9210 fpwwe2lem13 9343 fpwwe2 9344 isumltss 14419 rpnnen2lem12 14793 symgsssg 17710 symgfisg 17711 psgnunilem5 17737 lspsnat 18966 lsppratlem6 18973 lspprat 18974 lbsextlem4 18982 opsrtoslem2 19306 cnsubrg 19625 0ntr 20685 cmpfi 21021 dfcon2 21032 filcon 21497 cfinfil 21507 ufileu 21533 alexsublem 21658 ptcmplem2 21667 ptcmplem3 21668 restmetu 22185 reconnlem1 22437 bcthlem5 22933 itg10 23261 limcnlp 23448 upgrex 25759 umgraex 25852 uvtx01vtx 26020 ex-dif 26672 strlem1 28493 difioo 28934 baselcarsg 29695 difelcarsg 29699 sibfof 29729 sitg0 29735 frind 30984 onsucconi 31606 topdifinfeq 32374 fdc 32711 setindtr 36609 relnonrel 36912 caragenunidm 39398 uvtxa01vtx0 40623 |
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