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Mirrors > Home > MPE Home > Th. List > eqss | Structured version Visualization version GIF version |
Description: The subclass relationship is antisymmetric. Compare Theorem 4 of [Suppes] p. 22. (Contributed by NM, 21-May-1993.) |
Ref | Expression |
---|---|
eqss | ⊢ (𝐴 = 𝐵 ↔ (𝐴 ⊆ 𝐵 ∧ 𝐵 ⊆ 𝐴)) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | albiim 1806 | . 2 ⊢ (∀𝑥(𝑥 ∈ 𝐴 ↔ 𝑥 ∈ 𝐵) ↔ (∀𝑥(𝑥 ∈ 𝐴 → 𝑥 ∈ 𝐵) ∧ ∀𝑥(𝑥 ∈ 𝐵 → 𝑥 ∈ 𝐴))) | |
2 | dfcleq 2604 | . 2 ⊢ (𝐴 = 𝐵 ↔ ∀𝑥(𝑥 ∈ 𝐴 ↔ 𝑥 ∈ 𝐵)) | |
3 | dfss2 3557 | . . 3 ⊢ (𝐴 ⊆ 𝐵 ↔ ∀𝑥(𝑥 ∈ 𝐴 → 𝑥 ∈ 𝐵)) | |
4 | dfss2 3557 | . . 3 ⊢ (𝐵 ⊆ 𝐴 ↔ ∀𝑥(𝑥 ∈ 𝐵 → 𝑥 ∈ 𝐴)) | |
5 | 3, 4 | anbi12i 729 | . 2 ⊢ ((𝐴 ⊆ 𝐵 ∧ 𝐵 ⊆ 𝐴) ↔ (∀𝑥(𝑥 ∈ 𝐴 → 𝑥 ∈ 𝐵) ∧ ∀𝑥(𝑥 ∈ 𝐵 → 𝑥 ∈ 𝐴))) |
6 | 1, 2, 5 | 3bitr4i 291 | 1 ⊢ (𝐴 = 𝐵 ↔ (𝐴 ⊆ 𝐵 ∧ 𝐵 ⊆ 𝐴)) |
Colors of variables: wff setvar class |
Syntax hints: → wi 4 ↔ wb 195 ∧ wa 383 ∀wal 1473 = wceq 1475 ∈ wcel 1977 ⊆ wss 3540 |
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-in 3547 df-ss 3554 |
This theorem is referenced by: eqssi 3584 eqssd 3585 sseq1 3589 sseq2 3590 eqimss 3620 ssrabeq 3651 dfpss3 3655 compleq 3714 uneqin 3837 pssdifn0 3898 ss0b 3925 vss 3964 pwpw0 4284 sssn 4298 ssunsn 4300 pwsnALT 4367 unidif 4407 ssunieq 4408 uniintsn 4449 iuneq1 4470 iuneq2 4473 iunxdif2 4504 ssext 4850 pweqb 4852 eqopab2b 4930 pwun 4946 soeq2 4979 eqrel 5132 eqrelrel 5144 coeq1 5201 coeq2 5202 cnveq 5218 dmeq 5246 relssres 5357 xp11 5488 ssrnres 5491 ordtri4 5678 oneqmini 5693 fnres 5921 eqfnfv3 6221 fneqeql2 6234 dff3 6280 fconst4 6383 f1imaeq 6423 eqoprab2b 6611 iunpw 6870 orduniorsuc 6922 tfi 6945 fo1stres 7083 fo2ndres 7084 wfrlem8 7309 tz7.49 7427 oawordeulem 7521 nnacan 7595 nnmcan 7601 ixpeq2 7808 sbthlem3 7957 isinf 8058 ordunifi 8095 inficl 8214 rankr1c 8567 rankc1 8616 iscard 8684 iscard2 8685 carden2 8696 aleph11 8790 cardaleph 8795 alephinit 8801 dfac12a 8853 cflm 8955 cfslb2n 8973 dfacfin7 9104 wrdeq 13182 isumltss 14419 rpnnen2lem12 14793 isprm2 15233 mrcidb2 16101 iscyggen2 18106 iscyg3 18111 lssle0 18771 islpir2 19072 iscss2 19849 ishil2 19882 bastop1 20608 epttop 20623 iscld4 20679 0ntr 20685 opnneiid 20740 isperf2 20766 cnntr 20889 ist1-3 20963 perfcls 20979 cmpfi 21021 iscon2 21027 dfcon2 21032 snfil 21478 filcon 21497 ufileu 21533 alexsubALTlem4 21664 metequiv 22124 shlesb1i 27629 shle0 27685 orthin 27689 chcon2i 27707 chcon3i 27709 chlejb1i 27719 chabs2 27760 h1datomi 27824 cmbr4i 27844 osumcor2i 27887 pjjsi 27943 pjin2i 28436 stcltr2i 28518 mdbr2 28539 dmdbr2 28546 mdsl2i 28565 mdsl2bi 28566 mdslmd3i 28575 chrelat4i 28616 sumdmdlem2 28662 dmdbr5ati 28665 eqrelrd2 28806 dfon2lem9 30940 idsset 31167 fneval 31517 topdifinfeq 32374 equivtotbnd 32747 heiborlem10 32789 pmap11 34066 dia11N 35355 dia2dimlem5 35375 dib11N 35467 dih11 35572 dihglblem6 35647 doch11 35680 mapd11 35946 mapdcnv11N 35966 isnacs2 36287 mrefg3 36289 rababg 36898 relnonrel 36912 rcompleq 37338 uneqsn 37341 ntrk1k3eqk13 37368 ntrneineine1lem 37402 ntrneicls00 37407 ntrneixb 37413 ntrneik13 37416 ntrneix13 37417 prsal 39214 sssseq 40305 nbuhgr2vtx1edgblem 40573 |
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