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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 404 | . . . 4 ⊢ ((𝑥 ∈ 𝐴 → 𝑥 ∈ 𝐵) ↔ ¬ (𝑥 ∈ 𝐴 ∧ ¬ 𝑥 ∈ 𝐵)) | |
2 | eldif 3945 | . . . 4 ⊢ (𝑥 ∈ (𝐴 ∖ 𝐵) ↔ (𝑥 ∈ 𝐴 ∧ ¬ 𝑥 ∈ 𝐵)) | |
3 | 1, 2 | xchbinxr 337 | . . 3 ⊢ ((𝑥 ∈ 𝐴 → 𝑥 ∈ 𝐵) ↔ ¬ 𝑥 ∈ (𝐴 ∖ 𝐵)) |
4 | 3 | albii 1816 | . 2 ⊢ (∀𝑥(𝑥 ∈ 𝐴 → 𝑥 ∈ 𝐵) ↔ ∀𝑥 ¬ 𝑥 ∈ (𝐴 ∖ 𝐵)) |
5 | dfss2 3954 | . 2 ⊢ (𝐴 ⊆ 𝐵 ↔ ∀𝑥(𝑥 ∈ 𝐴 → 𝑥 ∈ 𝐵)) | |
6 | eq0 4307 | . 2 ⊢ ((𝐴 ∖ 𝐵) = ∅ ↔ ∀𝑥 ¬ 𝑥 ∈ (𝐴 ∖ 𝐵)) | |
7 | 4, 5, 6 | 3bitr4i 305 | 1 ⊢ (𝐴 ⊆ 𝐵 ↔ (𝐴 ∖ 𝐵) = ∅) |
Colors of variables: wff setvar class |
Syntax hints: ¬ wn 3 → wi 4 ↔ wb 208 ∧ wa 398 ∀wal 1531 = wceq 1533 ∈ wcel 2110 ∖ cdif 3932 ⊆ wss 3935 ∅c0 4290 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1792 ax-4 1806 ax-5 1907 ax-6 1966 ax-7 2011 ax-8 2112 ax-9 2120 ax-10 2141 ax-11 2157 ax-12 2173 ax-ext 2793 |
This theorem depends on definitions: df-bi 209 df-an 399 df-or 844 df-tru 1536 df-ex 1777 df-nf 1781 df-sb 2066 df-clab 2800 df-cleq 2814 df-clel 2893 df-nfc 2963 df-v 3496 df-dif 3938 df-in 3942 df-ss 3951 df-nul 4291 |
This theorem is referenced by: difn0 4323 pssdifn0 4324 difid 4329 vdif0 4417 difrab0eq 4418 difin0 4421 symdifv 5000 wfi 6175 ordintdif 6234 dffv2 6750 fndifnfp 6932 tfi 7562 peano5 7599 wfrlem8 7956 wfrlem16 7964 tz7.49 8075 oe0m1 8140 sdomdif 8659 php3 8697 sucdom2 8708 isinf 8725 unxpwdom2 9046 fin23lem26 9741 fin23lem21 9755 fin1a2lem13 9828 zornn0g 9921 fpwwe2lem13 10058 fpwwe2 10059 isumltss 15197 rpnnen2lem12 15572 symgsssg 18589 symgfisg 18590 psgnunilem5 18616 lspsnat 19911 lsppratlem6 19918 lspprat 19919 lbsextlem4 19927 opsrtoslem2 20259 cnsubrg 20599 0ntr 21673 cmpfi 22010 dfconn2 22021 filconn 22485 cfinfil 22495 ufileu 22521 alexsublem 22646 ptcmplem2 22655 ptcmplem3 22656 restmetu 23174 reconnlem1 23428 bcthlem5 23925 itg10 24283 limcnlp 24470 upgrex 26871 uvtx01vtx 27173 ex-dif 28196 strlem1 30021 difininv 30273 eqdif 30275 difioo 30499 pmtrcnelor 30730 baselcarsg 31559 difelcarsg 31563 sibfof 31593 sitg0 31599 chtvalz 31895 frpoind 33075 frind 33080 frrlem13 33130 frrlem14 33131 noextendseq 33169 onsucconni 33780 topdifinfeq 34625 nlpineqsn 34683 fdc 35014 setindtr 39614 relnonrel 39940 inaex 40626 caragenunidm 42784 |
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