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| Mirrors > Home > ILE Home > Th. List > eleq12d | GIF version | ||
| Description: Deduction from equality to equivalence of membership. (Contributed by NM, 31-May-1994.) |
| Ref | Expression |
|---|---|
| eleq1d.1 | ⊢ (𝜑 → 𝐴 = 𝐵) |
| eleq12d.2 | ⊢ (𝜑 → 𝐶 = 𝐷) |
| Ref | Expression |
|---|---|
| eleq12d | ⊢ (𝜑 → (𝐴 ∈ 𝐶 ↔ 𝐵 ∈ 𝐷)) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | eleq12d.2 | . . 3 ⊢ (𝜑 → 𝐶 = 𝐷) | |
| 2 | 1 | eleq2d 2308 | . 2 ⊢ (𝜑 → (𝐴 ∈ 𝐶 ↔ 𝐴 ∈ 𝐷)) |
| 3 | eleq1d.1 | . . 3 ⊢ (𝜑 → 𝐴 = 𝐵) | |
| 4 | 3 | eleq1d 2307 | . 2 ⊢ (𝜑 → (𝐴 ∈ 𝐷 ↔ 𝐵 ∈ 𝐷)) |
| 5 | 2, 4 | bitrd 188 | 1 ⊢ (𝜑 → (𝐴 ∈ 𝐶 ↔ 𝐵 ∈ 𝐷)) |
| Colors of variables: wff set class |
| This proof depends on syntax axioms: → wi 4 ↔ wb 105 = wceq 1402 ∈ wcel 2209 |
| This proof depends on axioms: ax-mp 5 ax-1 6 ax-2 7 ax-ia1 106 ax-ia2 107 ax-ia3 108 ax-5 1500 ax-gen 1502 ax-ie1 1546 ax-ie2 1547 ax-4 1563 ax-17 1579 ax-ial 1587 ax-ext 2220 |
| This proof depends on definitions: df-bi 117 df-cleq 2231 df-clel 2234 |
| This theorem is used by: cbvraldva2 2793 cbvrexdva2 2794 cdeqel 3047 ru 3050 sbceqbid 3058 sbcel12g 3162 cbvralcsf 3210 cbvrexcsf 3211 cbvreucsf 3212 cbvrabcsf 3213 onintexmid 4720 elvvuni 4839 elrnmpt1 5033 canth 6036 smoeq 6561 smores 6563 smores2 6565 iordsmo 6568 nnaordi 6781 nnaordr 6783 fvixp 6985 cbvixp 6997 mptelixpg 7016 opabfi 7247 exmidaclem 7565 cc1 7632 cc2lem 7633 cc3 7635 ltapig 7706 ltmpig 7707 fzsubel 10477 elfzp1b 10515 wrd2ind 11511 ennnfonelemg 13346 ennnfonelemp1 13349 ennnfonelemnn0 13365 ctiunctlemu1st 13377 ctiunctlemu2nd 13378 ctiunctlemudc 13380 ctiunctlemfo 13382 xpsfrnel 13717 ismgm 13729 mgm1 13742 issgrpd 13779 ismndd 13802 eqgfval 14077 prdsbasprj 14234 ringcl 14369 unitinvcl 14482 aprval 14643 aprap 14650 aprprop 14653 islmodd 14681 rspcl 14880 rnglidlmmgm 14885 zndvds 15036 istps 15192 tpspropd 15196 eltpsg 15200 isms 15613 mspropd 15638 cnlimci 15833 depindlem2 16882 |
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