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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 1816 | . 2 ⊢ (∀𝑥(𝑥 ∈ 𝐴 ↔ 𝑥 ∈ 𝐵) ↔ (∀𝑥(𝑥 ∈ 𝐴 → 𝑥 ∈ 𝐵) ∧ ∀𝑥(𝑥 ∈ 𝐵 → 𝑥 ∈ 𝐴))) | |
2 | dfcleq 2616 | . 2 ⊢ (𝐴 = 𝐵 ↔ ∀𝑥(𝑥 ∈ 𝐴 ↔ 𝑥 ∈ 𝐵)) | |
3 | dfss2 3591 | . . 3 ⊢ (𝐴 ⊆ 𝐵 ↔ ∀𝑥(𝑥 ∈ 𝐴 → 𝑥 ∈ 𝐵)) | |
4 | dfss2 3591 | . . 3 ⊢ (𝐵 ⊆ 𝐴 ↔ ∀𝑥(𝑥 ∈ 𝐵 → 𝑥 ∈ 𝐴)) | |
5 | 3, 4 | anbi12i 733 | . 2 ⊢ ((𝐴 ⊆ 𝐵 ∧ 𝐵 ⊆ 𝐴) ↔ (∀𝑥(𝑥 ∈ 𝐴 → 𝑥 ∈ 𝐵) ∧ ∀𝑥(𝑥 ∈ 𝐵 → 𝑥 ∈ 𝐴))) |
6 | 1, 2, 5 | 3bitr4i 292 | 1 ⊢ (𝐴 = 𝐵 ↔ (𝐴 ⊆ 𝐵 ∧ 𝐵 ⊆ 𝐴)) |
Colors of variables: wff setvar class |
Syntax hints: → wi 4 ↔ wb 196 ∧ wa 384 ∀wal 1481 = wceq 1483 ∈ wcel 1990 ⊆ wss 3574 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1722 ax-4 1737 ax-5 1839 ax-6 1888 ax-7 1935 ax-9 1999 ax-10 2019 ax-11 2034 ax-12 2047 ax-13 2246 ax-ext 2602 |
This theorem depends on definitions: df-bi 197 df-or 385 df-an 386 df-tru 1486 df-ex 1705 df-nf 1710 df-sb 1881 df-clab 2609 df-cleq 2615 df-clel 2618 df-in 3581 df-ss 3588 |
This theorem is referenced by: eqssi 3619 eqssd 3620 sssseq 3621 sseq1 3626 sseq2 3627 eqimss 3657 ssrabeq 3689 dfpss3 3693 compleq 3752 uneqin 3878 pssdifn0 3944 ss0b 3973 vss 4012 pwpw0 4344 sssn 4358 ssunsn 4360 pwsnALT 4429 unidif 4471 ssunieq 4472 uniintsn 4514 iuneq1 4534 iuneq2 4537 iunxdif2 4568 ssext 4923 pweqb 4925 eqopab2b 5005 pwun 5022 soeq2 5055 eqrel 5209 eqrelrel 5221 coeq1 5279 coeq2 5280 cnveq 5296 dmeq 5324 relssres 5437 xp11 5569 ssrnres 5572 ordtri4 5761 oneqmini 5776 fnres 6007 eqfnfv3 6313 fneqeql2 6326 dff3 6372 fconst4 6478 f1imaeq 6522 eqoprab2b 6713 iunpw 6978 orduniorsuc 7030 tfi 7053 fo1stres 7192 fo2ndres 7193 wfrlem8 7422 tz7.49 7540 oawordeulem 7634 nnacan 7708 nnmcan 7714 ixpeq2 7922 sbthlem3 8072 isinf 8173 ordunifi 8210 inficl 8331 rankr1c 8684 rankc1 8733 iscard 8801 iscard2 8802 carden2 8813 aleph11 8907 cardaleph 8912 alephinit 8918 dfac12a 8970 cflm 9072 cfslb2n 9090 dfacfin7 9221 wrdeq 13327 isumltss 14580 rpnnen2lem12 14954 isprm2 15395 mrcidb2 16278 iscyggen2 18283 iscyg3 18288 lssle0 18950 islpir2 19251 iscss2 20030 ishil2 20063 bastop1 20797 epttop 20813 iscld4 20869 0ntr 20875 opnneiid 20930 isperf2 20956 cnntr 21079 ist1-3 21153 perfcls 21169 cmpfi 21211 isconn2 21217 dfconn2 21222 snfil 21668 filconn 21687 ufileu 21723 alexsubALTlem4 21854 metequiv 22314 nbuhgr2vtx1edgblem 26247 shlesb1i 28245 shle0 28301 orthin 28305 chcon2i 28323 chcon3i 28325 chlejb1i 28335 chabs2 28376 h1datomi 28440 cmbr4i 28460 osumcor2i 28503 pjjsi 28559 pjin2i 29052 stcltr2i 29134 mdbr2 29155 dmdbr2 29162 mdsl2i 29181 mdsl2bi 29182 mdslmd3i 29191 chrelat4i 29232 sumdmdlem2 29278 dmdbr5ati 29281 eqrelrd2 29426 dfon2lem9 31696 idsset 31997 fneval 32347 topdifinfeq 33198 equivtotbnd 33577 heiborlem10 33619 eqrel2 34068 relcnveq3 34092 relcnveq2 34094 pmap11 35048 dia11N 36337 dia2dimlem5 36357 dib11N 36449 dih11 36554 dihglblem6 36629 doch11 36662 mapd11 36928 mapdcnv11N 36948 isnacs2 37269 mrefg3 37271 rababg 37879 relnonrel 37893 rcompleq 38318 uneqsn 38321 ntrk1k3eqk13 38348 ntrneineine1lem 38382 ntrneicls00 38387 ntrneixb 38393 ntrneik13 38396 ntrneix13 38397 prsal 40538 |
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