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Mirrors > Home > MPE Home > Th. List > cbveuw | Structured version Visualization version GIF version |
Description: Version of cbveu 2608 with a disjoint variable condition, which does not require ax-10 2143, ax-13 2371. (Contributed by NM, 25-Nov-1994.) (Revised by Gino Giotto, 23-May-2024.) |
Ref | Expression |
---|---|
cbveuw.1 | ⊢ Ⅎ𝑦𝜑 |
cbveuw.2 | ⊢ Ⅎ𝑥𝜓 |
cbveuw.3 | ⊢ (𝑥 = 𝑦 → (𝜑 ↔ 𝜓)) |
Ref | Expression |
---|---|
cbveuw | ⊢ (∃!𝑥𝜑 ↔ ∃!𝑦𝜓) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | cbveuw.1 | . . . 4 ⊢ Ⅎ𝑦𝜑 | |
2 | cbveuw.2 | . . . 4 ⊢ Ⅎ𝑥𝜓 | |
3 | cbveuw.3 | . . . 4 ⊢ (𝑥 = 𝑦 → (𝜑 ↔ 𝜓)) | |
4 | 1, 2, 3 | cbvexv1 2343 | . . 3 ⊢ (∃𝑥𝜑 ↔ ∃𝑦𝜓) |
5 | 1, 2, 3 | cbvmow 2602 | . . 3 ⊢ (∃*𝑥𝜑 ↔ ∃*𝑦𝜓) |
6 | 4, 5 | anbi12i 630 | . 2 ⊢ ((∃𝑥𝜑 ∧ ∃*𝑥𝜑) ↔ (∃𝑦𝜓 ∧ ∃*𝑦𝜓)) |
7 | df-eu 2568 | . 2 ⊢ (∃!𝑥𝜑 ↔ (∃𝑥𝜑 ∧ ∃*𝑥𝜑)) | |
8 | df-eu 2568 | . 2 ⊢ (∃!𝑦𝜓 ↔ (∃𝑦𝜓 ∧ ∃*𝑦𝜓)) | |
9 | 6, 7, 8 | 3bitr4i 306 | 1 ⊢ (∃!𝑥𝜑 ↔ ∃!𝑦𝜓) |
Colors of variables: wff setvar class |
Syntax hints: → wi 4 ↔ wb 209 ∧ wa 399 ∃wex 1787 Ⅎwnf 1791 ∃*wmo 2537 ∃!weu 2567 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1803 ax-4 1817 ax-5 1918 ax-6 1976 ax-7 2018 ax-11 2160 ax-12 2177 |
This theorem depends on definitions: df-bi 210 df-an 400 df-or 848 df-ex 1788 df-nf 1792 df-mo 2539 df-eu 2568 |
This theorem is referenced by: cbvreuw 3341 tz6.12f 6719 f1ompt 6906 climeu 15081 initoeu2 17476 |
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