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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 2209 | . 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 2121 |
This theorem depends on definitions: df-bi 116 df-cleq 2132 df-clel 2135 |
This theorem is referenced by: eleqtrrd 2219 3eltr3d 2222 eleqtrid 2228 eleqtrdi 2232 opth1 4158 0nelop 4170 tfisi 4501 ercl 6440 erth 6473 ecelqsdm 6499 phpm 6759 suplocexprlemmu 7526 suplocexprlemloc 7529 lincmb01cmp 9786 fzopth 9841 fzoaddel2 9970 fzosubel2 9972 fzocatel 9976 zpnn0elfzo1 9985 fzoend 9999 peano2fzor 10009 monoord2 10250 ser3mono 10251 bcpasc 10512 zfz1isolemiso 10582 fisum0diag2 11216 isumsplit 11260 prodmodclem3 11344 prodmodclem2a 11345 iscnp4 12387 cnrest2r 12406 txbasval 12436 txlm 12448 xmetunirn 12527 xblss2ps 12573 blbas 12602 mopntopon 12612 isxms2 12621 metcnpi 12684 metcnpi2 12685 tgioo 12715 cncfmpt2fcntop 12754 limccl 12797 limcimolemlt 12802 limccnp2cntop 12815 dvmulxxbr 12835 dvcoapbr 12840 dvcjbr 12841 dvrecap 12846 |
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