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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 7564 cc1 7631 cc2lem 7632 cc3 7634 ltapig 7705 ltmpig 7706 fzsubel 10468 elfzp1b 10506 wrd2ind 11497 ennnfonelemg 13296 ennnfonelemp1 13299 ennnfonelemnn0 13315 ctiunctlemu1st 13327 ctiunctlemu2nd 13328 ctiunctlemudc 13330 ctiunctlemfo 13332 xpsfrnel 13667 ismgm 13679 mgm1 13692 issgrpd 13729 ismndd 13752 eqgfval 14027 prdsbasprj 14184 ringcl 14319 unitinvcl 14432 aprval 14593 aprap 14600 aprprop 14603 islmodd 14631 rspcl 14830 rnglidlmmgm 14835 zndvds 14986 istps 15135 tpspropd 15139 eltpsg 15143 isms 15556 mspropd 15581 cnlimci 15776 depindlem2 16760 |
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