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Mirrors > Home > ILE Home > Th. List > eleqtrd | GIF version |
Description: Deduction that substitutes equal classes into membership. (Contributed by NM, 14-Dec-2004.) |
Ref | Expression |
---|---|
eleqtrd.1 | ⊢ (𝜑 → 𝐴 ∈ 𝐵) |
eleqtrd.2 | ⊢ (𝜑 → 𝐵 = 𝐶) |
Ref | Expression |
---|---|
eleqtrd | ⊢ (𝜑 → 𝐴 ∈ 𝐶) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | eleqtrd.1 | . 2 ⊢ (𝜑 → 𝐴 ∈ 𝐵) | |
2 | eleqtrd.2 | . . 3 ⊢ (𝜑 → 𝐵 = 𝐶) | |
3 | 2 | eleq2d 2210 | . 2 ⊢ (𝜑 → (𝐴 ∈ 𝐵 ↔ 𝐴 ∈ 𝐶)) |
4 | 1, 3 | mpbid 146 | 1 ⊢ (𝜑 → 𝐴 ∈ 𝐶) |
Colors of variables: wff set class |
Syntax hints: → wi 4 = wceq 1332 ∈ wcel 1481 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-ia1 105 ax-ia2 106 ax-ia3 107 ax-5 1424 ax-gen 1426 ax-ie1 1470 ax-ie2 1471 ax-4 1488 ax-17 1507 ax-ial 1515 ax-ext 2122 |
This theorem depends on definitions: df-bi 116 df-cleq 2133 df-clel 2136 |
This theorem is referenced by: eleqtrrd 2220 3eltr3d 2223 eleqtrid 2229 eleqtrdi 2233 opth1 4166 0nelop 4178 tfisi 4509 ercl 6448 erth 6481 ecelqsdm 6507 phpm 6767 cc2lem 7098 cc3 7100 suplocexprlemmu 7550 suplocexprlemloc 7553 lincmb01cmp 9816 fzopth 9872 fzoaddel2 10001 fzosubel2 10003 fzocatel 10007 zpnn0elfzo1 10016 fzoend 10030 peano2fzor 10040 monoord2 10281 ser3mono 10282 bcpasc 10544 zfz1isolemiso 10614 fisum0diag2 11248 isumsplit 11292 prodmodclem3 11376 prodmodclem2a 11377 iscnp4 12426 cnrest2r 12445 txbasval 12475 txlm 12487 xmetunirn 12566 xblss2ps 12612 blbas 12641 mopntopon 12651 isxms2 12660 metcnpi 12723 metcnpi2 12724 tgioo 12754 cncfmpt2fcntop 12793 limccl 12836 limcimolemlt 12841 limccnp2cntop 12854 dvmulxxbr 12874 dvcoapbr 12879 dvcjbr 12880 dvrecap 12885 |
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