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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 3946 | . . . 4 ⊢ (𝑥 ∈ (𝐴 ∖ 𝐵) ↔ (𝑥 ∈ 𝐴 ∧ ¬ 𝑥 ∈ 𝐵)) | |
3 | 1, 2 | xchbinxr 337 | . . 3 ⊢ ((𝑥 ∈ 𝐴 → 𝑥 ∈ 𝐵) ↔ ¬ 𝑥 ∈ (𝐴 ∖ 𝐵)) |
4 | 3 | albii 1820 | . 2 ⊢ (∀𝑥(𝑥 ∈ 𝐴 → 𝑥 ∈ 𝐵) ↔ ∀𝑥 ¬ 𝑥 ∈ (𝐴 ∖ 𝐵)) |
5 | dfss2 3955 | . 2 ⊢ (𝐴 ⊆ 𝐵 ↔ ∀𝑥(𝑥 ∈ 𝐴 → 𝑥 ∈ 𝐵)) | |
6 | eq0 4308 | . 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 1535 = wceq 1537 ∈ wcel 2114 ∖ cdif 3933 ⊆ wss 3936 ∅c0 4291 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1796 ax-4 1810 ax-5 1911 ax-6 1970 ax-7 2015 ax-8 2116 ax-9 2124 ax-10 2145 ax-11 2161 ax-12 2177 ax-ext 2793 |
This theorem depends on definitions: df-bi 209 df-an 399 df-or 844 df-tru 1540 df-ex 1781 df-nf 1785 df-sb 2070 df-clab 2800 df-cleq 2814 df-clel 2893 df-nfc 2963 df-v 3496 df-dif 3939 df-in 3943 df-ss 3952 df-nul 4292 |
This theorem is referenced by: difn0 4324 pssdifn0 4325 difid 4330 vdif0 4418 difrab0eq 4419 difin0 4422 symdifv 5008 wfi 6181 ordintdif 6240 dffv2 6756 fndifnfp 6938 tfi 7568 peano5 7605 wfrlem8 7962 wfrlem16 7970 tz7.49 8081 oe0m1 8146 sdomdif 8665 php3 8703 sucdom2 8714 isinf 8731 unxpwdom2 9052 fin23lem26 9747 fin23lem21 9761 fin1a2lem13 9834 zornn0g 9927 fpwwe2lem13 10064 fpwwe2 10065 isumltss 15203 rpnnen2lem12 15578 symgsssg 18595 symgfisg 18596 psgnunilem5 18622 lspsnat 19917 lsppratlem6 19924 lspprat 19925 lbsextlem4 19933 opsrtoslem2 20265 cnsubrg 20605 0ntr 21679 cmpfi 22016 dfconn2 22027 filconn 22491 cfinfil 22501 ufileu 22527 alexsublem 22652 ptcmplem2 22661 ptcmplem3 22662 restmetu 23180 reconnlem1 23434 bcthlem5 23931 itg10 24289 limcnlp 24476 upgrex 26877 uvtx01vtx 27179 ex-dif 28202 strlem1 30027 difininv 30279 eqdif 30281 difioo 30505 pmtrcnelor 30735 baselcarsg 31564 difelcarsg 31568 sibfof 31598 sitg0 31604 chtvalz 31900 frpoind 33080 frind 33085 frrlem13 33135 frrlem14 33136 noextendseq 33174 onsucconni 33785 topdifinfeq 34634 nlpineqsn 34692 fdc 35035 setindtr 39641 relnonrel 39967 inaex 40653 caragenunidm 42810 |
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