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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 1890 | . 2 ⊢ (∀𝑥(𝑥 ∈ 𝐴 ↔ 𝑥 ∈ 𝐵) ↔ (∀𝑥(𝑥 ∈ 𝐴 → 𝑥 ∈ 𝐵) ∧ ∀𝑥(𝑥 ∈ 𝐵 → 𝑥 ∈ 𝐴))) | |
2 | dfcleq 2817 | . 2 ⊢ (𝐴 = 𝐵 ↔ ∀𝑥(𝑥 ∈ 𝐴 ↔ 𝑥 ∈ 𝐵)) | |
3 | dfss2 3957 | . . 3 ⊢ (𝐴 ⊆ 𝐵 ↔ ∀𝑥(𝑥 ∈ 𝐴 → 𝑥 ∈ 𝐵)) | |
4 | dfss2 3957 | . . 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 1535 = wceq 1537 ∈ wcel 2114 ⊆ wss 3938 |
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 2795 |
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 2802 df-cleq 2816 df-clel 2895 df-in 3945 df-ss 3954 |
This theorem is referenced by: eqssi 3985 eqssd 3986 sssseq 3987 sseq1 3994 sseq2 3995 eqimss 4025 ssrabeq 4061 dfpss3 4065 compleq 4126 uneqin 4257 pssdifn0 4327 ss0b 4353 vss 4397 pwpw0 4748 sssn 4761 ssunsn 4763 pwsnOLD 4833 unidif 4874 ssunieq 4875 uniintsn 4915 iuneq1 4937 iuneq2 4940 iunxdif2 4979 ssext 5349 pweqb 5351 eqopab2bw 5437 eqopab2b 5441 pwun 5460 soeq2 5497 eqrel 5660 eqrelrel 5672 coeq1 5730 coeq2 5731 cnveq 5746 dmeq 5774 relssres 5895 xp11 6034 ssrnres 6037 ordtri4 6230 oneqmini 6244 fnres 6476 eqfnfv3 6806 fneqeql2 6819 dff3 6868 fconst4 6979 f1imaeq 7025 eqoprab2bw 7226 eqoprab2b 7227 iunpw 7495 orduniorsuc 7547 tfi 7570 fo1stres 7717 fo2ndres 7718 wfrlem8 7964 tz7.49 8083 oawordeulem 8182 nnacan 8256 nnmcan 8262 ixpeq2 8477 sbthlem3 8631 isinf 8733 ordunifi 8770 inficl 8891 rankr1c 9252 rankc1 9301 iscard 9406 iscard2 9407 carden2 9418 aleph11 9512 cardaleph 9517 alephinit 9523 dfac12a 9576 cflm 9674 cfslb2n 9692 dfacfin7 9823 wrdeq 13888 isumltss 15205 rpnnen2lem12 15580 isprm2 16028 mrcidb2 16891 smndex2dnrinv 18082 iscyggen2 19002 iscyg3 19007 lssle0 19723 islpir2 20026 iscss2 20832 ishil2 20865 bastop1 21603 epttop 21619 iscld4 21675 0ntr 21681 opnneiid 21736 isperf2 21762 cnntr 21885 ist1-3 21959 perfcls 21975 cmpfi 22018 isconn2 22024 dfconn2 22029 snfil 22474 filconn 22493 ufileu 22529 alexsubALTlem4 22660 metequiv 23121 nbuhgr2vtx1edgblem 27135 iscplgr 27199 shlesb1i 29165 shle0 29221 orthin 29225 chcon2i 29243 chcon3i 29245 chlejb1i 29255 chabs2 29296 h1datomi 29360 cmbr4i 29380 osumcor2i 29423 pjjsi 29479 pjin2i 29972 stcltr2i 30054 mdbr2 30075 dmdbr2 30082 mdsl2i 30101 mdsl2bi 30102 mdslmd3i 30111 chrelat4i 30152 sumdmdlem2 30198 dmdbr5ati 30201 eqdif 30283 eqrelrd2 30369 dfon2lem9 33038 idsset 33353 fneval 33702 topdifinfeq 34633 equivtotbnd 35058 heiborlem10 35100 eqrel2 35559 relcnveq3 35580 relcnveq2 35582 cossssid 35709 elrelscnveq3 35733 elrelscnveq2 35735 pmap11 36900 dia11N 38186 dia2dimlem5 38206 dib11N 38298 dih11 38403 dihglblem6 38478 doch11 38511 mapd11 38777 mapdcnv11N 38797 isnacs2 39310 mrefg3 39312 ontric3g 39895 rababg 39940 relnonrel 39954 rcompleq 40377 uneqsn 40380 ntrk1k3eqk13 40407 ntrneineine1lem 40441 ntrneicls00 40446 ntrneixb 40452 ntrneik13 40455 ntrneix13 40456 |
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