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Related theorems GIF version |
| Description: Substitution of equal classes into membership relation, deduction form. (Contributed by Raph Levien, 10-Dec-02.) |
| Ref | Expression |
|---|---|
| eqeltrd.1 | ⊢ (φ → A = B) |
| eqeltrd.2 | ⊢ (φ → B ∈ C) |
| Ref | Expression |
|---|---|
| eqeltrd | ⊢ (φ → A ∈ C) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | eqeltrd.2 | . 2 ⊢ (φ → B ∈ C) | |
| 2 | eqeltrd.1 | . . 3 ⊢ (φ → A = B) | |
| 3 | 2 | eleq1d 1155 | . 2 ⊢ (φ → (A ∈ C ↔ B ∈ C)) |
| 4 | 1, 3 | mpbird 171 | 1 ⊢ (φ → A ∈ C) |
| Colors of variables: wff set class |
| Syntax hints: → wi 2 = wceq 1091 ∈ wcel 1092 |
| This theorem is referenced by: eqeltrrd 1164 onuninsuc 2356 tz9.12lem3 3505 rankon 3515 oncardon 3627 oncardid 3628 cardcf 3706 addclpi 3814 mulclpi 3815 addclpq 3852 mulclpq 3854 addclsr 3986 mulclsr 3987 axaddcl 4066 axaddrcl 4067 axmulcl 4068 axmulrcl 4069 resubclt 4173 nn0addclt 4551 nn0mulcl 4553 zsubclt 4591 flclt 4624 qsubclt 4645 qdivclt 4647 sqclt 4684 reclt 4796 imclt 4797 cjclt 4800 facclt 4874 ruclem13 4897 hvsubclt 4998 normclt 5076 shsubclt 5125 axpjclt 5247 spanclt 5305 hsupclt 5308 sshjclt 5328 spansncht 5465 hosclt 5491 hodclt 5492 spansnsclt 5541 3oalem2 5553 pjocin 5583 hococl 5599 pjcocl 5629 pjcohocl 5655 pj2cocl 5657 mdsymlem1 5776 mdsymlem3 5778 |
| This theorem was proved from axioms: ax-1 3 ax-2 4 ax-3 5 ax-mp 6 ax-4 673 ax-5 674 ax-gen 677 ax-17 925 ax-ext 1074 |
| This theorem depends on definitions: df-bi 128 df-an 198 df-ex 679 df-cleq 1097 df-clel 1099 |