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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 2207 | . 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 1331 ∈ wcel 1480 |
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 1423 ax-gen 1425 ax-ie1 1469 ax-ie2 1470 ax-4 1487 ax-17 1506 ax-ial 1514 ax-ext 2119 |
This theorem depends on definitions: df-bi 116 df-cleq 2130 df-clel 2133 |
This theorem is referenced by: eleqtrrd 2217 3eltr3d 2220 eleqtrid 2226 eleqtrdi 2230 opth1 4153 0nelop 4165 tfisi 4496 ercl 6433 erth 6466 ecelqsdm 6492 phpm 6752 suplocexprlemmu 7519 suplocexprlemloc 7522 lincmb01cmp 9779 fzopth 9834 fzoaddel2 9963 fzosubel2 9965 fzocatel 9969 zpnn0elfzo1 9978 fzoend 9992 peano2fzor 10002 monoord2 10243 ser3mono 10244 bcpasc 10505 zfz1isolemiso 10575 fisum0diag2 11209 isumsplit 11253 iscnp4 12376 cnrest2r 12395 txbasval 12425 txlm 12437 xmetunirn 12516 xblss2ps 12562 blbas 12591 mopntopon 12601 isxms2 12610 metcnpi 12673 metcnpi2 12674 tgioo 12704 cncfmpt2fcntop 12743 limccl 12786 limcimolemlt 12791 limccnp2cntop 12804 dvmulxxbr 12824 dvcoapbr 12829 dvcjbr 12830 dvrecap 12835 |
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