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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 405 | . . . 4 ⊢ ((𝑥 ∈ 𝐴 → 𝑥 ∈ 𝐵) ↔ ¬ (𝑥 ∈ 𝐴 ∧ ¬ 𝑥 ∈ 𝐵)) | |
2 | eldif 3891 | . . . 4 ⊢ (𝑥 ∈ (𝐴 ∖ 𝐵) ↔ (𝑥 ∈ 𝐴 ∧ ¬ 𝑥 ∈ 𝐵)) | |
3 | 1, 2 | xchbinxr 338 | . . 3 ⊢ ((𝑥 ∈ 𝐴 → 𝑥 ∈ 𝐵) ↔ ¬ 𝑥 ∈ (𝐴 ∖ 𝐵)) |
4 | 3 | albii 1821 | . 2 ⊢ (∀𝑥(𝑥 ∈ 𝐴 → 𝑥 ∈ 𝐵) ↔ ∀𝑥 ¬ 𝑥 ∈ (𝐴 ∖ 𝐵)) |
5 | dfss2 3901 | . 2 ⊢ (𝐴 ⊆ 𝐵 ↔ ∀𝑥(𝑥 ∈ 𝐴 → 𝑥 ∈ 𝐵)) | |
6 | eq0 4258 | . 2 ⊢ ((𝐴 ∖ 𝐵) = ∅ ↔ ∀𝑥 ¬ 𝑥 ∈ (𝐴 ∖ 𝐵)) | |
7 | 4, 5, 6 | 3bitr4i 306 | 1 ⊢ (𝐴 ⊆ 𝐵 ↔ (𝐴 ∖ 𝐵) = ∅) |
Colors of variables: wff setvar class |
Syntax hints: ¬ wn 3 → wi 4 ↔ wb 209 ∧ wa 399 ∀wal 1536 = wceq 1538 ∈ wcel 2111 ∖ cdif 3878 ⊆ wss 3881 ∅c0 4243 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1797 ax-4 1811 ax-5 1911 ax-6 1970 ax-7 2015 ax-8 2113 ax-9 2121 ax-ext 2770 |
This theorem depends on definitions: df-bi 210 df-an 400 df-ex 1782 df-sb 2070 df-clab 2777 df-cleq 2791 df-clel 2870 df-v 3443 df-dif 3884 df-in 3888 df-ss 3898 df-nul 4244 |
This theorem is referenced by: difn0 4278 pssdifn0 4279 difid 4284 vdif0 4376 difrab0eq 4377 difin0 4380 symdifv 4971 wfi 6149 ordintdif 6208 dffv2 6733 fndifnfp 6915 tfi 7548 peano5 7585 wfrlem8 7945 wfrlem16 7953 tz7.49 8064 oe0m1 8129 sucdom2 8610 sdomdif 8649 php3 8687 isinf 8715 unxpwdom2 9036 fin23lem26 9736 fin23lem21 9750 fin1a2lem13 9823 zornn0g 9916 fpwwe2lem13 10053 fpwwe2 10054 isumltss 15195 rpnnen2lem12 15570 symgsssg 18587 symgfisg 18588 psgnunilem5 18614 lspsnat 19910 lsppratlem6 19917 lspprat 19918 lbsextlem4 19926 cnsubrg 20151 opsrtoslem2 20724 0ntr 21676 cmpfi 22013 dfconn2 22024 filconn 22488 cfinfil 22498 ufileu 22524 alexsublem 22649 ptcmplem2 22658 ptcmplem3 22659 restmetu 23177 reconnlem1 23431 bcthlem5 23932 itg10 24292 limcnlp 24481 upgrex 26885 uvtx01vtx 27187 ex-dif 28208 strlem1 30033 difininv 30288 eqdif 30290 difioo 30531 pmtrcnelor 30785 baselcarsg 31674 difelcarsg 31678 sibfof 31708 sitg0 31714 chtvalz 32010 frpoind 33193 frind 33198 frrlem13 33248 frrlem14 33249 noextendseq 33287 onsucconni 33898 topdifinfeq 34767 nlpineqsn 34825 fdc 35183 setindtr 39965 relnonrel 40287 inaex 41005 caragenunidm 43147 |
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