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Mirrors > Home > MPE Home > Th. List > eqssi | Structured version Visualization version GIF version |
Description: Infer equality from two subclass relationships. Compare Theorem 4 of [Suppes] p. 22. (Contributed by NM, 9-Sep-1993.) |
Ref | Expression |
---|---|
eqssi.1 | ⊢ 𝐴 ⊆ 𝐵 |
eqssi.2 | ⊢ 𝐵 ⊆ 𝐴 |
Ref | Expression |
---|---|
eqssi | ⊢ 𝐴 = 𝐵 |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | eqssi.1 | . 2 ⊢ 𝐴 ⊆ 𝐵 | |
2 | eqssi.2 | . 2 ⊢ 𝐵 ⊆ 𝐴 | |
3 | eqss 3583 | . 2 ⊢ (𝐴 = 𝐵 ↔ (𝐴 ⊆ 𝐵 ∧ 𝐵 ⊆ 𝐴)) | |
4 | 1, 2, 3 | mpbir2an 957 | 1 ⊢ 𝐴 = 𝐵 |
Colors of variables: wff setvar class |
Syntax hints: = wceq 1475 ⊆ 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: inv1 3922 unv 3923 intab 4442 intabs 4752 intid 4853 dmv 5262 0ima 5401 fresaunres2 5989 find 6983 dftpos4 7258 wfrlem16 7317 dfom3 8427 tc2 8501 tcidm 8505 tc0 8506 rankuni 8609 rankval4 8613 ackbij1 8943 cfom 8969 fin23lem16 9040 itunitc 9126 inaprc 9537 nqerf 9631 dmrecnq 9669 dmaddsr 9785 dmmulsr 9786 axaddf 9845 axmulf 9846 dfnn2 10910 dfuzi 11344 unirnioo 12144 uzrdgfni 12619 0bits 14999 4sqlem19 15505 ledm 17047 lern 17048 efgsfo 17975 0frgp 18015 indiscld 20705 leordtval2 20826 lecldbas 20833 llyidm 21101 nllyidm 21102 toplly 21103 lly1stc 21109 txuni2 21178 txindis 21247 ust0 21833 qdensere 22383 xrtgioo 22417 zdis 22427 xrhmeo 22553 bndth 22565 ismbf3d 23227 dvef 23547 reeff1o 24005 efifo 24097 dvloglem 24194 logf1o2 24196 choc1 27570 shsidmi 27627 shsval2i 27630 omlsii 27646 chdmm1i 27720 chj1i 27732 chm0i 27733 shjshsi 27735 span0 27785 spanuni 27787 sshhococi 27789 spansni 27800 pjoml4i 27830 pjrni 27945 shatomistici 28604 sumdmdlem2 28662 rinvf1o 28814 sigapildsys 29552 sxbrsigalem0 29660 dya2iocucvr 29673 sxbrsigalem4 29676 sxbrsiga 29679 ballotth 29926 kur14lem6 30447 mrsubrn 30664 msubrn 30680 filnetlem3 31545 filnetlem4 31546 onint1 31618 oninhaus 31619 bj-rabtr 32118 bj-rabtrALTALT 32120 bj-rabtrAUTO 32121 bj-nuliotaALT 32211 icoreunrn 32383 comptiunov2i 37017 compne 37665 unisnALT 38184 fsumiunss 38642 fourierdlem62 39061 fouriersw 39124 salexct 39228 salgencntex 39237 |
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