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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 3976 | . 2 ⊢ (𝜑 → 𝐵 ⊆ 𝐴) |
5 | 1, 4 | eqssd 3987 | 1 ⊢ (𝜑 → 𝐴 = 𝐵) |
Colors of variables: wff setvar class |
Syntax hints: → wi 4 ∧ wa 398 = 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: wfrlem10 7967 ordtypelem9 8993 ordtypelem10 8994 oismo 9007 prlem934 10458 phimullem 16119 prmreclem5 16259 psssdm2 17828 sylow3lem3 18757 ablfacrp 19191 isdrng2 19515 fidomndrng 20083 mplbas2 20254 pjfo 20862 obs2ss 20876 frlmsslsp 20943 restfpw 21790 2ndcsep 22070 ptclsg 22226 trfg 22502 restutopopn 22850 unirnblps 23032 unirnbl 23033 clsocv 23856 rrxbasefi 24016 pjth 24045 opnmbllem 24205 dvidlem 24516 dvaddf 24542 dvmulf 24543 dvcof 24548 dvcj 24550 dvrec 24555 dvcnv 24577 dvcnvre 24619 ftc1cn 24643 ulmdv 24994 pserdv 25020 ppisval2 25685 nbupgruvtxres 27192 dimkerim 31027 fedgmul 31031 reff 31107 dya2iocuni 31545 cvmsss2 32525 opnmbllem0 34932 ftc1cnnc 34970 lkrlsp 36242 cdleme50rnlem 37684 hdmaprnN 39004 hgmaprnN 39041 qsalrel 39131 kercvrlsm 39689 pwssplit4 39695 hbtlem5 39734 restuni3 41390 disjf1o 41458 unirnmapsn 41483 iunmapsn 41486 icoiccdif 41806 iccdificc 41821 lptioo2 41918 lptioo1 41919 qndenserrn 42591 intsaluni 42619 iundjiun 42749 meadjiunlem 42754 meaiininclem 42775 iunhoiioo 42965 |
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