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Mirrors > Home > ILE Home > Th. List > eleq1a | GIF version |
Description: A transitive-type law relating membership and equality. (Contributed by NM, 9-Apr-1994.) |
Ref | Expression |
---|---|
eleq1a | ⊢ (𝐴 ∈ 𝐵 → (𝐶 = 𝐴 → 𝐶 ∈ 𝐵)) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | eleq1 2100 | . 2 ⊢ (𝐶 = 𝐴 → (𝐶 ∈ 𝐵 ↔ 𝐴 ∈ 𝐵)) | |
2 | 1 | biimprcd 149 | 1 ⊢ (𝐴 ∈ 𝐵 → (𝐶 = 𝐴 → 𝐶 ∈ 𝐵)) |
Colors of variables: wff set class |
Syntax hints: → wi 4 = wceq 1243 ∈ wcel 1393 |
This theorem was proved from axioms: ax-1 5 ax-2 6 ax-mp 7 ax-ia1 99 ax-ia2 100 ax-ia3 101 ax-5 1336 ax-gen 1338 ax-ie1 1382 ax-ie2 1383 ax-4 1400 ax-17 1419 ax-ial 1427 ax-ext 2022 |
This theorem depends on definitions: df-bi 110 df-cleq 2033 df-clel 2036 |
This theorem is referenced by: elex22 2569 elex2 2570 reu6 2730 disjne 3273 ssimaex 5234 fnex 5383 f1ocnv2d 5704 tfrlem8 5934 eroprf 6199 ac6sfi 6352 recclnq 6490 prnmaddl 6588 renegcl 7272 nn0ind-raph 8355 iccid 8794 bj-nn0suc 10089 bj-inf2vnlem2 10096 bj-nn0sucALT 10103 |
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