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Mirrors > Home > MPE Home > Th. List > eqelssd | Structured version Visualization version GIF version |
Description: Equality deduction from subclass relationship and membership. (Contributed by AV, 21-Aug-2022.) |
Ref | Expression |
---|---|
eqelssd.1 | ⊢ (𝜑 → 𝐴 ⊆ 𝐵) |
eqelssd.2 | ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐵) → 𝑥 ∈ 𝐴) |
Ref | Expression |
---|---|
eqelssd | ⊢ (𝜑 → 𝐴 = 𝐵) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | eqelssd.1 | . 2 ⊢ (𝜑 → 𝐴 ⊆ 𝐵) | |
2 | eqelssd.2 | . . . 4 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐵) → 𝑥 ∈ 𝐴) | |
3 | 2 | ex 415 | . . 3 ⊢ (𝜑 → (𝑥 ∈ 𝐵 → 𝑥 ∈ 𝐴)) |
4 | 3 | ssrdv 3973 | . 2 ⊢ (𝜑 → 𝐵 ⊆ 𝐴) |
5 | 1, 4 | eqssd 3984 | 1 ⊢ (𝜑 → 𝐴 = 𝐵) |
Colors of variables: wff setvar class |
Syntax hints: → wi 4 ∧ wa 398 = wceq 1537 ∈ wcel 2114 ⊆ wss 3936 |
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 2793 |
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 2800 df-cleq 2814 df-clel 2893 df-in 3943 df-ss 3952 |
This theorem is referenced by: wfrlem10 7964 ordtypelem9 8990 ordtypelem10 8991 oismo 9004 prlem934 10455 phimullem 16116 prmreclem5 16256 psssdm2 17825 sylow3lem3 18754 ablfacrp 19188 isdrng2 19512 fidomndrng 20080 mplbas2 20251 pjfo 20859 obs2ss 20873 frlmsslsp 20940 restfpw 21787 2ndcsep 22067 ptclsg 22223 trfg 22499 restutopopn 22847 unirnblps 23029 unirnbl 23030 clsocv 23853 rrxbasefi 24013 pjth 24042 opnmbllem 24202 dvidlem 24513 dvaddf 24539 dvmulf 24540 dvcof 24545 dvcj 24547 dvrec 24552 dvcnv 24574 dvcnvre 24616 ftc1cn 24640 ulmdv 24991 pserdv 25017 ppisval2 25682 nbupgruvtxres 27189 dimkerim 31023 fedgmul 31027 reff 31103 dya2iocuni 31541 cvmsss2 32521 opnmbllem0 34943 ftc1cnnc 34981 lkrlsp 36253 cdleme50rnlem 37695 hdmaprnN 39015 hgmaprnN 39052 qsalrel 39174 kercvrlsm 39732 pwssplit4 39738 hbtlem5 39777 restuni3 41433 disjf1o 41501 unirnmapsn 41526 iunmapsn 41529 icoiccdif 41849 iccdificc 41864 lptioo2 41961 lptioo1 41962 qndenserrn 42633 intsaluni 42661 iundjiun 42791 meadjiunlem 42796 meaiininclem 42817 iunhoiioo 43007 |
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