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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 1889 | . 2 ⊢ (∀𝑥(𝑥 ∈ 𝐴 ↔ 𝑥 ∈ 𝐵) ↔ (∀𝑥(𝑥 ∈ 𝐴 → 𝑥 ∈ 𝐵) ∧ ∀𝑥(𝑥 ∈ 𝐵 → 𝑥 ∈ 𝐴))) | |
2 | dfcleq 2818 | . 2 ⊢ (𝐴 = 𝐵 ↔ ∀𝑥(𝑥 ∈ 𝐴 ↔ 𝑥 ∈ 𝐵)) | |
3 | dfss2 3958 | . . 3 ⊢ (𝐴 ⊆ 𝐵 ↔ ∀𝑥(𝑥 ∈ 𝐴 → 𝑥 ∈ 𝐵)) | |
4 | dfss2 3958 | . . 3 ⊢ (𝐵 ⊆ 𝐴 ↔ ∀𝑥(𝑥 ∈ 𝐵 → 𝑥 ∈ 𝐴)) | |
5 | 3, 4 | anbi12i 628 | . 2 ⊢ ((𝐴 ⊆ 𝐵 ∧ 𝐵 ⊆ 𝐴) ↔ (∀𝑥(𝑥 ∈ 𝐴 → 𝑥 ∈ 𝐵) ∧ ∀𝑥(𝑥 ∈ 𝐵 → 𝑥 ∈ 𝐴))) |
6 | 1, 2, 5 | 3bitr4i 305 | 1 ⊢ (𝐴 = 𝐵 ↔ (𝐴 ⊆ 𝐵 ∧ 𝐵 ⊆ 𝐴)) |
Colors of variables: wff setvar class |
Syntax hints: → wi 4 ↔ wb 208 ∧ wa 398 ∀wal 1534 = wceq 1536 ∈ wcel 2113 ⊆ wss 3939 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1795 ax-4 1809 ax-5 1910 ax-6 1969 ax-7 2014 ax-8 2115 ax-9 2123 ax-10 2144 ax-11 2160 ax-12 2176 ax-ext 2796 |
This theorem depends on definitions: df-bi 209 df-an 399 df-or 844 df-tru 1539 df-ex 1780 df-nf 1784 df-sb 2069 df-clab 2803 df-cleq 2817 df-clel 2896 df-in 3946 df-ss 3955 |
This theorem is referenced by: eqssi 3986 eqssd 3987 sssseq 3988 sseq1 3995 sseq2 3996 eqimss 4026 ssrabeq 4062 dfpss3 4066 compleq 4127 uneqin 4258 pssdifn0 4328 ss0b 4354 vss 4398 pwpw0 4749 sssn 4762 ssunsn 4764 pwsnOLD 4834 unidif 4875 ssunieq 4876 uniintsn 4916 iuneq1 4938 iuneq2 4941 iunxdif2 4980 ssext 5350 pweqb 5352 eqopab2bw 5438 eqopab2b 5442 pwun 5461 soeq2 5498 eqrel 5661 eqrelrel 5673 coeq1 5731 coeq2 5732 cnveq 5747 dmeq 5775 relssres 5896 xp11 6035 ssrnres 6038 ordtri4 6231 oneqmini 6245 fnres 6477 eqfnfv3 6807 fneqeql2 6820 dff3 6869 fconst4 6980 f1imaeq 7026 eqoprab2bw 7227 eqoprab2b 7228 iunpw 7496 orduniorsuc 7548 tfi 7571 fo1stres 7718 fo2ndres 7719 wfrlem8 7965 tz7.49 8084 oawordeulem 8183 nnacan 8257 nnmcan 8263 ixpeq2 8478 sbthlem3 8632 isinf 8734 ordunifi 8771 inficl 8892 rankr1c 9253 rankc1 9302 iscard 9407 iscard2 9408 carden2 9419 aleph11 9513 cardaleph 9518 alephinit 9524 dfac12a 9577 cflm 9675 cfslb2n 9693 dfacfin7 9824 wrdeq 13889 isumltss 15206 rpnnen2lem12 15581 isprm2 16029 mrcidb2 16892 smndex2dnrinv 18083 iscyggen2 19003 iscyg3 19008 lssle0 19724 islpir2 20027 iscss2 20833 ishil2 20866 bastop1 21604 epttop 21620 iscld4 21676 0ntr 21682 opnneiid 21737 isperf2 21763 cnntr 21886 ist1-3 21960 perfcls 21976 cmpfi 22019 isconn2 22025 dfconn2 22030 snfil 22475 filconn 22494 ufileu 22530 alexsubALTlem4 22661 metequiv 23122 nbuhgr2vtx1edgblem 27136 iscplgr 27200 shlesb1i 29166 shle0 29222 orthin 29226 chcon2i 29244 chcon3i 29246 chlejb1i 29256 chabs2 29297 h1datomi 29361 cmbr4i 29381 osumcor2i 29424 pjjsi 29480 pjin2i 29973 stcltr2i 30055 mdbr2 30076 dmdbr2 30083 mdsl2i 30102 mdsl2bi 30103 mdslmd3i 30112 chrelat4i 30153 sumdmdlem2 30199 dmdbr5ati 30202 eqdif 30284 eqrelrd2 30370 dfon2lem9 33040 idsset 33355 fneval 33704 topdifinfeq 34635 equivtotbnd 35060 heiborlem10 35102 eqrel2 35561 relcnveq3 35582 relcnveq2 35584 cossssid 35711 elrelscnveq3 35735 elrelscnveq2 35737 pmap11 36902 dia11N 38188 dia2dimlem5 38208 dib11N 38300 dih11 38405 dihglblem6 38480 doch11 38513 mapd11 38779 mapdcnv11N 38799 isnacs2 39309 mrefg3 39311 ontric3g 39894 rababg 39939 relnonrel 39953 rcompleq 40376 uneqsn 40379 ntrk1k3eqk13 40406 ntrneineine1lem 40440 ntrneicls00 40445 ntrneixb 40451 ntrneik13 40454 ntrneix13 40455 |
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