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Mirrors > Home > MPE Home > Th. List > csbieb | Structured version Visualization version GIF version |
Description: Bidirectional conversion between an implicit class substitution hypothesis 𝑥 = 𝐴 → 𝐵 = 𝐶 and its explicit substitution equivalent. (Contributed by NM, 2-Mar-2008.) |
Ref | Expression |
---|---|
csbieb.1 | ⊢ 𝐴 ∈ V |
csbieb.2 | ⊢ Ⅎ𝑥𝐶 |
Ref | Expression |
---|---|
csbieb | ⊢ (∀𝑥(𝑥 = 𝐴 → 𝐵 = 𝐶) ↔ ⦋𝐴 / 𝑥⦌𝐵 = 𝐶) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | csbieb.1 | . 2 ⊢ 𝐴 ∈ V | |
2 | csbieb.2 | . 2 ⊢ Ⅎ𝑥𝐶 | |
3 | csbiebt 3919 | . 2 ⊢ ((𝐴 ∈ V ∧ Ⅎ𝑥𝐶) → (∀𝑥(𝑥 = 𝐴 → 𝐵 = 𝐶) ↔ ⦋𝐴 / 𝑥⦌𝐵 = 𝐶)) | |
4 | 1, 2, 3 | mp2an 690 | 1 ⊢ (∀𝑥(𝑥 = 𝐴 → 𝐵 = 𝐶) ↔ ⦋𝐴 / 𝑥⦌𝐵 = 𝐶) |
Colors of variables: wff setvar class |
Syntax hints: → wi 4 ↔ wb 205 ∀wal 1539 = wceq 1541 ∈ wcel 2106 Ⅎwnfc 2882 Vcvv 3473 ⦋csb 3889 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1797 ax-4 1811 ax-5 1913 ax-6 1971 ax-7 2011 ax-8 2108 ax-9 2116 ax-10 2137 ax-11 2154 ax-12 2171 ax-ext 2702 |
This theorem depends on definitions: df-bi 206 df-an 397 df-or 846 df-3an 1089 df-tru 1544 df-ex 1782 df-nf 1786 df-sb 2068 df-clab 2709 df-cleq 2723 df-clel 2809 df-nfc 2884 df-v 3475 df-sbc 3774 df-csb 3890 |
This theorem is referenced by: csbiebg 3922 |
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